How Does C#'s `using` Keyword Manage Resources, and What Enhancements Did C# 8 Introduce?

In -depth understanding of

keywords using Keywords play a key role in C# resource management. This article will explore its mechanism in depth and focus on introducing improvements introduced in C# 8.

using The resource release mechanism of statement

The statement ensures that the object automatically releases the resources after exceeding the domain, and there is no need to write an additional release code. Just as "" UNDERSTANDING THE 'USING' Statement in C#"(Codeproject" and "USING Objects Thatable IDisposoft" (Microsoft ", the C#compiler will code as follows: using

Converted to:

using C# 8

State

<code class="language-csharp">using (MyResource myRes = new MyResource())
{
    myRes.DoSomething();
}</code>

C# 8 introduced a more concise grammar-

<code class="language-csharp">{ // 限制myRes的作用域
    MyResource myRes = new MyResource();
    try
    {
        myRes.DoSomething();
    }
    finally
    {
        // 检查资源是否为空。
        if (myRes != null)
            // 调用对象的Dispose方法。
            ((IDisposable)myRes).Dispose();
    }
}</code>

Declaration:

using Declaration is a variable statement that starts with keywords, which indicates that the compiler releases a variable at the end of the closed scope.

using Therefore, the above code can be rewritten with a more concise

statement:

using When the program executes the scope of the using variable (usually the method, or it may be a code block),

will be automatically released.

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