jquery - ASP.NET MVC - Ajax 将空值传递给 Controller

Question

我正在尝试使用 Ajax 将数据从 View 发送到 Controller ，但数据以 null 形式发送到 Controller 。我尝试了很多方法，但找不到 solution.frombody 属性没有修复问题，我在启动时做了一些更改，但它们也没有帮助我。

这是我的脚本:

$(document).ready(function() {
    $("#addColumn").click(function() {
        AddColumnRecords();
    });
    $("#saveRecords").click(function() {
        SaveRecords();
    });
});

function AddColumnRecords() {
    var columnRecords="<tr><td>" + $("#columnName").val() + "</td><td>" + $("#type").val() +"</td><td>"+ document.getElementById('primaryCheck').checked+ "</td></tr>";
    $("#ColumnTable").last().append(columnRecords);
     $("#columnName").val(" ");
}

function SaveRecords() {
    var Columns = new Array();
     $("#ColumnTable").find("tr:gt(0)").each(function(){
        var name=$(this).find("td:eq(0)").text();
        var type=$(this).find("td:eq(1)").text();
        var isPrimary=$(this).find("td:eq(2)").text();
        var ColumnModel={};
        ColumnModel.Name = name;
        ColumnModel.Type = parseInt(type);
        ColumnModel.IsPrimaryKey = isPrimary;
        Columns.push(ColumnModel);
     });
    var Table={};
    var tableName=$("#tableName").val();
    Table.TableName=tableName;
    Table.Columns=Columns;
    console.log(JSON.stringify(Table));

    $.ajax({
        type:'POST',
        dataType:'JSON',
        contentType:'application/json; charset=utf-8',
        url:'/table/createtable',
        data:{table : JSON.stringify(Table)},
        success:function(data){alert("success")},
        error:function(){alert("error")}
    });
}

我的 table 是:

public class Table
{
    public string TableName { get; set; }
    public List<Column> Columns { get; set; } = new List<Column>();
}

列模型类是:

public class Column
{
    public string Name { get; set; }
    public virtual Types Type { get; set; } = Types.String;
    public virtual bool IsPrimaryKey { get; set; } = false;
}

这是 Action 方法:

[HttpPost]
public IActionResult CreateTable([FromBody] Table table)
{
    return View();
}

console log

<div class="mb-3">
    <label for="tableName" class="form-label">Table Name</label>
    <input type="text" class="form-control" id="tableName" aria-describedby="tableName">
  </div>

<form>
  <div class="mb-3">
    <label for="columnName" class="form-label">Name</label>
    <input type="text" class="form-control" id="columnName" aria-describedby="columnName">
  </div>
  <div class="mb-3">
        <select class="form-select" aria-label="Default select example" id="type">
            @{
                <option value=3>@DatabaseSample.Models.Types.String</option>
                <option value=0>@DatabaseSample.Models.Types.Integer</option>
                <option value=5>@DatabaseSample.Models.Types.Boolean</option>
                <option value=4>@DatabaseSample.Models.Types.Char</option>
                <option value=2>@DatabaseSample.Models.Types.Double</option>
                <option value=1>@DatabaseSample.Models.Types.Float</option>
                <option value=6>@DatabaseSample.Models.Types.Date</option>
            }
</select>
  </div>

  <div class="mb-3 form-check">
    <input type="checkbox" class="form-check-input" id="primaryCheck">
    <label class="form-check-label" for="exampleCheck1">Primary key</label>
  </div>
  
</form>

<button id="addColumn" type="submit" class="btn btn-primary">Submit</button>




<table class="table" id="ColumnTable">
  <thead>
    <tr>
      <th scope="col">Column name</th>
      <th scope="col">Type</th>
      <th scope="col">Primary key</th>
    </tr>
  </thead>
</table>
<button id="saveRecords" type="submit" class="btn btn-primary">Save</button>

Answer 1

下面是一个工作demo，大家可以引用。

像下面这样改变ajax:

    ...
    var Table={};
    var tableName=$("#tableName").val();
    Table.TableName=tableName;
    Table.Columns=Columns;
    console.log(JSON.stringify(Table));
  

      $.ajax({
                url:'/Home/Createtable',  
                type:'POST',                   
                data:Table,
                success:function(data){alert("success")},
                error:function(){alert("error")}               
            });

在家庭 Controller 中:

       public IActionResult Index()
        {
            return View();
        }
       [HttpPost]
        public JsonResult CreateTable(Table table, List<Column> Columns)
        {
            var ccc = 0;  // do your staff...
            return Json(ccc);
        }

结果: