c# 用于存储的单独类

Question

我使用了多个类，我需要一个...假设所有类和方法的全局存储。创建用于存储的静态类是否正确？

public static class Storage
    {
        public static string filePath { get; set; }
    }

或者还有其他方法吗？

Answer 1

如果您真的需要让您的示例成为单例，那么您可以按照以下方式进行操作。

public class StorageSingleton
{
    private static readonly StorageSingleton instance;

    static StorageSingleton() { 
         instance = new Singleton();
    }
    // Mark constructor as private as no one can create it but itself.
    private StorageSingleton() 
    { 
        // For constructing
    }

    // The only way to access the created instance.
    public static StorageSingleton Instance
    {
        get 
        {
            return instance;
        }
    }        

    // Note that this will be null when the instance if not set to
    // something in the constructor.
    public string FilePath { get; set; }
}

调用和设置单例的方法如下:

// Is this is the first time you call "Instance" then it will create itself
var storage = StorageSingleton.Instance;

if (storage.FilePath == null)
{
    storage.FilePath = "myfile.txt";
}

或者，您可以将以下内容添加到构造函数中以避免空引用异常:

// Mark constructor as private as no one can create it but itself.
private StorageSingleton() 
{ 
    FilePath = string.Empty; 
}

警告语；从长远来看，制作任何全局或单例都会破坏您的代码。稍后您真的应该检查存储库模式。