flutter - 类型 'TextEditingController' 不是类型转换中类型 'int' 的子类型-6ren

flutter - 类型 'TextEditingController' 不是类型转换中类型 'int' 的子类型

转载作者：行者123 更新时间：2023-12-03 03:00:38

我正在尝试从用户那里获取 4 个输入以显示最小值、最大值并显示中间值 1 和中间值 2。现在的事实是，每当我尝试输入以对其执行操作以显示我的答案时。它显示“类型'TextEditingController'不是类型转换中类型'int'的子类型”。我使用 int.parse() 方法将其转换为字符串，但仍然没有用。这是我的代码:

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:inputtext/convert.dart';

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  int min, max, mid1, mid2, temp;
  String output = '';
  TextEditingController inputvalue1 = new TextEditingController();
  TextEditingController inputvalue2 = new TextEditingController();
  TextEditingController inputvalue3 = new TextEditingController();
  TextEditingController inputvalue4 = new TextEditingController();
  // @override
  // void initState() {
  //   super.initState();
  //   inputvalues = new TextEditingController();
  //   inputvalues.text = '';
  // }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(
          'InputValue',
          style: TextStyle(
            color: Colors.white,
          ),
        ),
      ),
      body: Container(
        color: Colors.blueAccent[50],
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            SizedBox(
              height: 5,
            ),
            Flexible(
              flex: 1,
              child: TextFormField(
                autofocus: true,
                controller: inputvalue1,
                keyboardType: TextInputType.number,
                inputFormatters: <TextInputFormatter>[
                  WhitelistingTextInputFormatter.digitsOnly,
                ],
                decoration: InputDecoration(
                  hoverColor: Colors.blueGrey,
                  border: OutlineInputBorder(
                    borderRadius: BorderRadius.all(
                      Radius.circular(4.0),
                    ),
                  ),
                  labelText: 'Enter Values',
                ),
              ),
            ),
            SizedBox(height: 10),
            Center(
              child: TextFormField(
                autofocus: true,
                controller: inputvalue2,
                keyboardType: TextInputType.number,
                inputFormatters: <TextInputFormatter>[
                  WhitelistingTextInputFormatter.digitsOnly,
                ],
                decoration: InputDecoration(
                  hoverColor: Colors.blueGrey,
                  border: OutlineInputBorder(
                    borderRadius: BorderRadius.all(
                      Radius.circular(4.0),
                    ),
                  ),
                  labelText: 'Enter Values',
                ),
              ),
            ),
            SizedBox(height: 10),
            Center(
              child: TextFormField(
                autofocus: true,
                controller: inputvalue3,
                keyboardType: TextInputType.number,
                inputFormatters: <TextInputFormatter>[
                  WhitelistingTextInputFormatter.digitsOnly,
                ],
                decoration: InputDecoration(
                  hoverColor: Colors.blueGrey,
                  border: OutlineInputBorder(
                    borderRadius: BorderRadius.all(
                      Radius.circular(4.0),
                    ),
                  ),
                  labelText: 'Enter Values',
                ),
              ),
            ),
            SizedBox(height: 10),
            Center(
              child: TextFormField(
                //validator: (),
                autofocus: true,
                controller: inputvalue4,

                keyboardType: TextInputType.number,
                inputFormatters: <TextInputFormatter>[
                  WhitelistingTextInputFormatter.digitsOnly,
                ],
                decoration: InputDecoration(
                  hoverColor: Colors.blueGrey,
                  border: OutlineInputBorder(
                    borderRadius: BorderRadius.all(
                      Radius.circular(4.0),
                    ),
                  ),
                  labelText: 'Enter Values',
                ),
              ),
            ),
            SizedBox(height: 10),

            RaisedButton(
              child: Text(
                'Submit',
                style: TextStyle(color: Colors.blue),
              ),
              onPressed: () {
                comp();
              },
            ),
            SizedBox(
              height: 10,
            ),
            RaisedButton(
              onPressed: () {
                Navigator.push(
                  context,
                  MaterialPageRoute(builder: (context) => Convert()),
                );
              },
              child: Text(
                'Next',
                style: TextStyle(color: Colors.blue),
              ),
            ),

            //Text(result),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          return showDialog(
            context: context,
            barrierDismissible: true,
            builder: (context) {
              return SimpleDialog(
                title: Text("Values"),
                // content: TextField(controller: inputvalue1),
                children: <Widget>[
                  SimpleDialogOption(
                    onPressed: () {
                      setState(() {
                        print('Minimum Value= ' + min.toString());
                      });
                    },
                  ),
                ],
              );
            },
          );

          // setState(() {
          //   print('Minimum Value=' + min.toString());
          //   print('Maximum Value=' + max.toString());
          //   print('Mid1=' + mid1.toString());
          //   print('Mid2 =' + mid2.toString());
          // });
          // Navigator.of(context).pop();
        },
      ),
    );
  }

  void comp() {
    if (inputvalue1.text.toString() == inputvalue2.text.toString() ||
        inputvalue1.text.toString() == inputvalue3.text.toString() ||
        inputvalue1.text.toString() == inputvalue4.text.toString()) {
      print('Please input different number');
    } else if (inputvalue2.text.toString() == inputvalue3.text.toString() ||
        inputvalue2.text.toString() == inputvalue4.text.toString()) {
      print('Please input different number');
    } else if (inputvalue3.text.toString() == inputvalue4.text.toString()) {
      print('Please enter differet vlaues');
    }
    //Finding minimum value
    if (int.parse(inputvalue1.text) <= int.parse(inputvalue2.text) &&
        int.parse(inputvalue1.text) <= int.parse(inputvalue3.text) &&
        int.parse(inputvalue1.text) <= int.parse(inputvalue4.text)) {
      min = inputvalue1 as int;
    } else if (int.parse(inputvalue2.text) <= int.parse(inputvalue3.text) &&
        int.parse(inputvalue2.text) <= int.parse(inputvalue4.text)) {
      min = inputvalue2 as int;
    } else if (int.parse(inputvalue3.text) <= int.parse(inputvalue4.text)) {
      min = inputvalue3 as int;
    } else {
      min = inputvalue4 as int;
    }
    //finding maximum number
    if (int.parse(inputvalue1.text) >= int.parse(inputvalue2.text) &&
        int.parse(inputvalue1.text) >= int.parse(inputvalue2.text) &&
        int.parse(inputvalue1.text) >= int.parse(inputvalue3.text) &&
        int.parse(inputvalue1.text) >= int.parse(inputvalue4.text)) {
      max = inputvalue1 as int;
    } else if (int.parse(inputvalue2.text) >= int.parse(inputvalue3.text) &&
        int.parse(inputvalue2.text) >= int.parse(inputvalue4.text)) {
      max = inputvalue2 as int;
    } else if (int.parse(inputvalue3.text) >= int.parse(inputvalue4.text)) {
      max = inputvalue3 as int;
    } else {
      max = inputvalue4 as int;
    }
    //finding mid1
    if (int.parse(inputvalue1.text) != min &&
        int.parse(inputvalue1.text) != max) {
      mid1 = inputvalue1 as int;
    } else if (int.parse(inputvalue2.text) != min &&
        int.parse(inputvalue2.text) != max) {
      mid1 = inputvalue2 as int;
    } else if (int.parse(inputvalue3.text) != min &&
        int.parse(inputvalue3.text) != max) {
      mid1 = inputvalue3 as int;
    } else if (int.parse(inputvalue4.text) != min &&
        int.parse(inputvalue4.text) != max) {
      mid1 = inputvalue4 as int;
    }

    //finding mid2
    if (int.parse(inputvalue1.text) != mid1 &&
        int.parse(inputvalue1.text) != min &&
        int.parse(inputvalue1.text) != max) {
      mid2 = inputvalue1 as int;
    } else if (int.parse(inputvalue2.text) != mid1 &&
        int.parse(inputvalue2.text) != min &&
        int.parse(inputvalue2.text) != max) {
      mid2 = inputvalue2 as int;
    } else if (int.parse(inputvalue3.text) != mid1 &&
        int.parse(inputvalue3.text) != min &&
        int.parse(inputvalue3.text) != max) {
      mid2 = inputvalue3 as int;
    } else if (int.parse(inputvalue4.text) != mid1 &&
        int.parse(inputvalue4.text) != min &&
        int.parse(inputvalue4.text) != max) {
      mid2 = inputvalue4 as int;
    }
    if (mid1 > mid2) {
      temp = mid1;
      mid1 = mid2;
      mid2 = temp;
    }
  }
}

感谢您的回答

错误日志

══╡ EXCEPTION CAUGHT BY FOUNDATION LIBRARY ╞════════════════════════════════════════════════════════
I/flutter ( 5462): The following assertion was thrown while dispatching notifications for FocusNode:
I/flutter ( 5462): RenderBox was not laid out: RenderEditable#cd6b6 NEEDS-LAYOUT NEEDS-PAINT
I/flutter ( 5462): 'package:flutter/src/rendering/box.dart':
I/flutter ( 5462): Failed assertion: line 1687 pos 12: 'hasSize'
I/flutter ( 5462):
I/flutter ( 5462): Either the assertion indicates an error in the framework itself, or we should provide substantially
I/flutter ( 5462): more information in this error message to help you determine and fix the underlying cause.
I/flutter ( 5462): In either case, please report this assertion by filing a bug on GitHub:
I/flutter ( 5462):   https://github.com/flutter/flutter/issues/new?template=BUG.md
I/flutter ( 5462):
I/flutter ( 5462): When the exception was thrown, this was the stack:
I/flutter ( 5462): #2      RenderBox.size 
package:flutter/…/rendering/box.dart:1687
I/flutter ( 5462): #3      EditableTextState._updateSizeAndTransform 
package:flutter/…/widgets/editable_text.dart:1729
I/flutter ( 5462): #4      EditableTextState._openInputConnection 
package:flutter/…/widgets/editable_text.dart:1415
I/flutter ( 5462): #5      EditableTextState._openOrCloseInputConnectionIfNeeded 
package:flutter/…/widgets/editable_text.dart:1441
I/flutter ( 5462): #6      EditableTextState._handleFocusChanged 
package:flutter/…/widgets/editable_text.dart:1707
I/flutter ( 5462): #7      ChangeNotifier.notifyListeners 
package:flutter/…/foundation/change_notifier.dart:206
I/flutter ( 5462): #8      FocusNode._notify 
package:flutter/…/widgets/focus_manager.dart:825
I/flutter ( 5462): #9      FocusManager._applyFocusChange 
package:flutter/…/widgets/focus_manager.dart:1456
I/flutter ( 5462): (elided 12 frames from class _AssertionError and package dart:async)
I/flutter ( 5462):
I/flutter ( 5462): The FocusNode sending notification was:
I/flutter ( 5462):   FocusNode#bbc92
I/flutter ( 5462): ════════════════════════════════════════════════════════════════════════════════════════════════════

 Exception caught by gesture ═══════════════════════════════════════════
The following _CastError was thrown while handling a gesture:
type 'TextEditingController' is not a subtype of type 'int' in type cast

When the exception was thrown, this was the stack
#0      _HomePageState.comp 
package:inputtext/homepage.dart:213
#1      _HomePageState.build.<anonymous closure> 
package:inputtext/homepage.dart:133
#2      _InkResponseState._handleTap 
package:flutter/…/material/ink_well.dart:706
#3      _InkResponseState.build.<anonymous closure> 
package:flutter/…/material/ink_well.dart:789
#4      GestureRecognizer.invokeCallback 
package:flutter/…/gestures/recognizer.dart:182
...
Handler: "onTap"
Recognizer: TapGestureRecognizer#e5be9
    debugOwner: GestureDetector
    state: possible
    won arena
    finalPosition: Offset(212.6, 351.2)
    finalLocalPosition: Offset(50.8, 5.9)
    button: 1
    sent tap down
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by gesture ═══════════════════════════════════════════
type 'TextEditingController' is not a subtype of type 'int' in type cast
════════════════════════════════════════════════════════════════════════════════
Reloaded 2 of 480 libraries in 585ms.
Reloaded 2 of 480 libraries in 262ms.

════════ Exception caught by gesture ═══════════════════════════════════════════
The following _CastError was thrown while handling a gesture:
type 'TextEditingController' is not a subtype of type 'int' in type cast

When the exception was thrown, this was the stack
#0      _HomePageState.comp 
package:inputtext/homepage.dart:210
#1      _HomePageState.build.<anonymous closure> 
package:inputtext/homepage.dart:133
#2      _InkResponseState._handleTap 
package:flutter/…/material/ink_well.dart:706
#3      _InkResponseState.build.<anonymous closure> 
package:flutter/…/material/ink_well.dart:789
#4      GestureRecognizer.invokeCallback                         package:flutter/…/gestures/recognizer.dart:182
...
Handler: "onTap"
Recognizer: TapGestureRecognizer#e5be9
    debugOwner: GestureDetector
    state: possible
    won arena
    finalPosition: Offset(201.1, 369.1)
    finalLocalPosition: Offset(39.4, 23.8)
    button: 1
    sent tap down
════════════════════════════════════════════════════════════════════════════════
Reloaded 2 of 480 libraries in 2,487ms.

════════ Exception caught by gesture ═══════════════════════════════════════════
The following _CastError was thrown while handling a gesture:
type 'TextEditingController' is not a subtype of type 'int' in type cast

When the exception was thrown, this was the stack
#0      _HomePageState.comp 
package:inputtext/homepage.dart:210
#1      _HomePageState.build.<anonymous closure> 
package:inputtext/homepage.dart:133
#2      _InkResponseState._handleTap 
package:flutter/…/material/ink_well.dart:706
#3      _InkResponseState.build.<anonymous closure> 
package:flutter/…/material/ink_well.dart:789
#4      GestureRecognizer.invokeCallback 
package:flutter/…/gestures/recognizer.dart:182
...
Handler: "onTap"
Recognizer: TapGestureRecognizer#e5be9
    debugOwner: GestureDetector
    state: possible
    won arena
    finalPosition: Offset(220.2, 368.0)
    finalLocalPosition: Offset(58.5, 22.6)
    button: 1
    sent tap down
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by gesture ═══════════════════════════════════════════
type 'TextEditingController' is not a subtype of type 'int' in type cast
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by gesture ═══════════════════════════════════════════
type 'TextEditingController' is not a subtype of type 'int' in type cast
════════════════════════════════════════════════════════════════════════════════

════════ Exception caught by gesture ═══════════════════════════════════════════
type 'TextEditingController' is not a subtype of type 'int' in type cast

最佳答案

只需检查下面的示例

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

void main() => runApp(HomePage());

class HomePage extends StatefulWidget {
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  int min, max, mid1, mid2, temp;
  String output = '';
  TextEditingController inputvalue1 = new TextEditingController();
  TextEditingController inputvalue2 = new TextEditingController();
  TextEditingController inputvalue3 = new TextEditingController();
  TextEditingController inputvalue4 = new TextEditingController();
  // @override
  // void initState() {
  //   super.initState();
  //   inputvalues = new TextEditingController();
  //   inputvalues.text = '';
  // }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
          home: Scaffold(
        appBar: AppBar(
          title: Text(
            'InputValue',
            style: TextStyle(
              color: Colors.white,
            ),
          ),
        ),
        body: Container(
          color: Colors.blueAccent[50],
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              SizedBox(
                height: 5,
              ),
              Flexible(
                flex: 1,
                child: TextFormField(
                  autofocus: true,
                  controller: inputvalue1,
                  keyboardType: TextInputType.number,
                  inputFormatters: <TextInputFormatter>[
                    WhitelistingTextInputFormatter.digitsOnly,
                  ],
                  decoration: InputDecoration(
                    hoverColor: Colors.blueGrey,
                    border: OutlineInputBorder(
                      borderRadius: BorderRadius.all(
                        Radius.circular(4.0),
                      ),
                    ),
                    labelText: 'Enter Values',
                  ),
                ),
              ),
              SizedBox(height: 10),
              Center(
                child: TextFormField(
                  autofocus: true,
                  controller: inputvalue2,
                  keyboardType: TextInputType.number,
                  inputFormatters: <TextInputFormatter>[
                    WhitelistingTextInputFormatter.digitsOnly,
                  ],
                  decoration: InputDecoration(
                    hoverColor: Colors.blueGrey,
                    border: OutlineInputBorder(
                      borderRadius: BorderRadius.all(
                        Radius.circular(4.0),
                      ),
                    ),
                    labelText: 'Enter Values',
                  ),
                ),
              ),
              SizedBox(height: 10),
              Center(
                child: TextFormField(
                  autofocus: true,
                  controller: inputvalue3,
                  keyboardType: TextInputType.number,
                  inputFormatters: <TextInputFormatter>[
                    WhitelistingTextInputFormatter.digitsOnly,
                  ],
                  decoration: InputDecoration(
                    hoverColor: Colors.blueGrey,
                    border: OutlineInputBorder(
                      borderRadius: BorderRadius.all(
                        Radius.circular(4.0),
                      ),
                    ),
                    labelText: 'Enter Values',
                  ),
                ),
              ),
              SizedBox(height: 10),
              Center(
                child: TextFormField(
                  //validator: (),
                  autofocus: true,
                  controller: inputvalue4,

                  keyboardType: TextInputType.number,
                  inputFormatters: <TextInputFormatter>[
                    WhitelistingTextInputFormatter.digitsOnly,
                  ],
                  decoration: InputDecoration(
                    hoverColor: Colors.blueGrey,
                    border: OutlineInputBorder(
                      borderRadius: BorderRadius.all(
                        Radius.circular(4.0),
                      ),
                    ),
                    labelText: 'Enter Values',
                  ),
                ),
              ),
              SizedBox(height: 10),

              RaisedButton(
                child: Text(
                  'Submit',
                  style: TextStyle(color: Colors.blue),
                ),
                onPressed: () {
                  comp();
                },
              ),
              SizedBox(
                height: 10,
              ),
              RaisedButton(
                onPressed: () {
                  Navigator.push(
                    context,
                    MaterialPageRoute(builder: (context) => Convert()),
                  );
                },
                child: Text(
                  'Next',
                  style: TextStyle(color: Colors.blue),
                ),
              ),

              //Text(result),
            ],
          ),
        ),
        floatingActionButton: FloatingActionButton(
          onPressed: () {
            return showDialog(
              context: context,
              barrierDismissible: true,
              builder: (context) {
                return SimpleDialog(
                  title: Text("Values"),
                  // content: TextField(controller: inputvalue1),
                  children: <Widget>[
                    SimpleDialogOption(
                      onPressed: () {
                        setState(() {
                          print('Minimum Value= ' + min.toString());
                        });
                      },
                    ),
                  ],
                );
              },
            );

            // setState(() {
            //   print('Minimum Value=' + min.toString());
            //   print('Maximum Value=' + max.toString());
            //   print('Mid1=' + mid1.toString());
            //   print('Mid2 =' + mid2.toString());
            // });
            // Navigator.of(context).pop();
          },
        ),
      ),
    );
  }

  void comp() {
      int value1 =int.parse(inputvalue1.text);
      int value2 =int.parse(inputvalue2.text);
      int value3 = int.parse(inputvalue3.text);
      int value4 =int.parse(inputvalue4.text);

    if (value1 == value2||
        value1 == value3||
        value1 == value4) {
      print('Please input different number');
    } else if (value2 == value3 ||
        value2 == value4) {
      print('Please input different number');
    } else if (value3== value4) {
      print('Please enter differet vlaues');
    }
    //Finding minimum value
    if (value1 <= value2 &&
        value1 <= value3 &&
        value1 <= value4) {
      min = value1;
    } else if (value2 <= value3 &&
        value2 <= value4) {
      min = value2;
    } else if (value3 <= value4) {
      min = value3;
    } else {
      min = value4;
    }

    print('Print the minimun number  : $min');
    //finding maximum number
    if (value1 >= value2&&
        value1 >= value2 &&
        value1 >= value3 &&
        value1 >= value4) {
      max = value1;
    } else if (value2 >= value3 &&
        value2 >= value4) {
      max = value2;
    } else if (value3 >= value4) {
      max = value3;
    } else {
      max = value4;
    }
    print('this is the max number : $max');

    //finding mid1
    if (value1 != min &&
        value1!= max) {
      mid1 = value1;
    } else if (value2 != min &&
        value2 != max) {
      mid1 = value2;
    } else if (value3!= min &&
        value3 != max) {
      mid1 = value3;
    } else if (value4 != min &&
        value4 != max) {
      mid1 = value4;
    }
    print('This is the mid value  $mid1');

    //finding mid2
    if (value1 != mid1 &&
        value1 != min &&
        value1 != max) {
      mid2 = value1;
    } else if (value2 != mid1 &&
        value2 != min &&
        value2!= max) {
      mid2 =value2;
    } else if (value3 != mid1 &&
        value3 != min &&
        value3 != max) {
      mid2 = value3;
    } else if (value4 != mid1 &&
        value4 != min &&
        value4 != max) {
      mid2 = value4;
    }
    print('This is the mid 2 $mid2');

    if (mid1 > mid2) {
      temp = mid1;
      mid1 = mid2;
      mid2 = temp;
    }
  }
}

如果有用请告诉我

关于flutter - 类型 'TextEditingController' 不是类型转换中类型 'int' 的子类型，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/60785956/

文章推荐： javascript - 如何重新加载html标签对象数据？

文章推荐： azure - 在azure中调用Intranet站点触发器/函数

文章推荐： javascript - VUE JS 图片从数组绑定(bind)

haskell - 类型家庭类型黑客
我正在尝试编写一个相当多态的库。我遇到了一种更容易表现出来却很难说出来的情况。它看起来有点像这样: {-# LANGUAGE ScopedTypeVariables #-} {-# LANGUAGE
javascript - 这是如何运作的？类型 = 类型 || 'any' ;
谁能解释一下这个表达式是如何工作的？ type = type || 'any'; 这是否意味着如果类型未定义则使用“任意”？最佳答案如果 type 为“falsy”(即 false，或 undef
f# - 类型 'obj' 不是接口(interface)类型
我有一个界面，在IAnimal.fs中， namespace Kingdom type IAnimal = abstract member Eat : Food -> unit 以及另一个成功
c++ - 类型(变量)与(类型)变量
这个问题在这里已经有了答案: 关闭 10 年前。 Possible Duplicate: What is the difference between (type)value and type(va
c# - 默认(可空(类型))与默认(类型)
在 C# 中，default(Nullable) 之间有区别吗？ (或 default(long?) )和 default(long) ？ Long只是一个例子，它可以是任何其他struct类型。最
scala - 如何定义一个 HList 类型，但基于另一个 HList 类型
假设我有一个案例类: case class Foo(num: Int, str: String, bool: Boolean) 现在我还有一个简单的包装器: sealed trait Wrapper[
c# - 如何在运行时定义委托(delegate)类型(即动态委托(delegate)类型)
这个问题在这里已经有了答案: Create C# delegate type with ref parameter at runtime (1 个回答) 关闭 2 年前。为了即时创建委托(dele
python - dct 中的断言失败(类型 == CV_32FC1 || 类型 == CV_64FC1)
我正在尝试获取图像的 dct。一开始我遇到了错误 The function/feature is not implemented (Odd-size DCT's are not implemented
ios - PList 类型？应用程序/x-plist 类型
我正在尝试使用 AFNetworking 的 AFPropertyListRequestOperation，但是当我尝试下载它时，出现错误预期的内容类型{( “应用程序/x-plist” )}, 得
javascript - 元素隐式具有 'any' 类型，因为索引表达式不是 'number' 类型
我在下面收到错误。我知道这段代码的意思，但我不知道界面应该是什么样子: Element implicitly has an 'any' type because index expression is
swift2 - 类型 'Error' 约束为非协议(protocol)类型，即使类型是协议(protocol)
我尝试将 SignalType 从 ReactiveCocoa 扩展为自定义 ErrorType，代码如下所示 enum MyError: ErrorType { // .. cases }
scala - 如何使用 Scala 的 this 类型、抽象类型等来实现 Self 类型？
我无法在任何其他问题中找到答案。假设我有一个抽象父类(super class) Abstract0，它有两个子类 Concrete1 和 Concrete1。我希望能够在 Abstract0 中定义类
日期时间字段上的 MySQL 索引不是 RANGE 类型，而是使用 INDEX 类型
我想知道为什么这个索引没有用在 RANGE 类型中，而是用在 INDEX 中: 索引: CREATE INDEX myindex ON orders(order_date); 查询: EXPLAIN
java - IncompleteClassChangeError ...原本应该是 direct 类型，但结果却发现是 virtual 类型
我正在使用 RxJava，现在我尝试通过提供 lambda 来订阅可观察对象: observableProvider.stringForKey(CURRENT_DELETED_ID) .sub
javascript - MIME 类型 ('text/html' ) 不是受支持的样式表 MIME 类型
我已经尝试了几乎所有解决问题的方法，其中包括。为提供类型使用app.use(express.static('public'))还有更多，但我似乎无法为此找到解决方案。 index.js : imp
css - 哪个更快？输入[类型 ="submit"] 或 [类型 ="submit"]
以下哪个 CSS 选择器更快？ input[type="submit"] { /* styles */ } 或 [type="submit"] { /* styles */ } 只是好
java - 通过构造函数参数表达的不满足的依赖关系，索引为 0 类型 -> 没有合格的 bean 类型
我不知道这个设置有什么问题，我在 IDEA 中获得了所有注释(@Controller、@Repository、@Service)，它在行号左侧显示 bean，然后转到该 bean。这是错误: 14-
c - jni 回调适用于 java 类型，但不适用于 c 类型
我听从了建议 registering java function as a callback in C function并且可以使用“简单”类型(例如整数和字符串)进行回调，例如: jstring j
java - 将 java 类型 string[] 映射到 oracle 类型
有一些 java 类，加载到 Oracle 数据库(版本 11g)和 pl/sql 函数包装器: create or replace function getDataFromJava( in_uLis
javascript - 元素隐式具有 'any' 类型，因为索引表达式不是 'number' 类型 [7015]
我已经从 David Walsh 的 css 动画回调中获取代码并将其修改为 TypeScript。但是，我收到一个错误，我不知道为什么: interface IBrowserPrefix { [

行者123

个人简介

我是一名优秀的程序员,十分优秀！

作者热门文章

滴滴打车优惠券免费领取

全站热门文章

首页

博学

6Ren·AI

商城

flutter - 类型 'TextEditingController' 不是类型转换中类型 'int' 的子类型