How Can I Create Custom Compiler Warnings in .NET?

Create custom compiler warnings

.NET's ObsoleteAttribute attribute can trigger a compiler warning that a method or property is obsolete and should be replaced. But in some cases, you may want a more customized warning message. Here's how to create a custom property that generates a compiler warning with the message you specify:

<code class="language-csharp">[MyAttribute("这段代码很糟糕，需要检查")]
public void DoEverything()
{
}</code>

<code class="language-vb.net"><MyAttribute("这段代码很糟糕，需要检查")>
Public Sub DoEverything()
End Sub
</MyAttribute></code>

While creating a custom property is easy, the key challenge is making it trigger a compiler warning in Visual Studio. Here is a possible solution:

<code class="language-csharp">[Obsolete("需要重构")]
public class MustRefactor : System.Attribute {}</code>

By adding [MustRefactor] to your method you will generate a compile-time warning. The resulting error message may not be ideal, but it is customizable.

Update:

This improved code generates clearer warnings:

<code class="language-csharp">[TooManyArgs] // 尝试移除一些参数
public User(String userName)
{
    this.userName = userName;   
}

[MustRefactor] // 此处需要重构
public override string ToString()
{
    return "User: " + userName;
}

// 自定义属性
[Obsolete("此处需要重构")]
public class MustRefactor : System.Attribute
{

}
[Obsolete("尝试移除一些参数")]
public class TooManyArgs : System.Attribute
{

}</code>

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