C＃.NET CORE如何获取自定义属性的值？ [英] C# .NET CORE how to get the value of a custom attribute?

问题描述

我有一个定义如下的自定义属性类。

I have a custom attribute class defined as follows.

[AttributeUsage(AttributeTargets.Property, Inherited = false)]
internal class EncryptedAttribute : System.Attribute
{
    private bool _encrypted;
    public EncryptedAttribute(bool encrypted)
    {
        _encrypted = encrypted;
    }

    public virtual bool Encrypted
    {
        get
        {
            return _encrypted;
        }
    }
}

我将上述属性应用于

public class KeyVaultConfiguration
{
    [Encrypted(true)]
    public string AuthClientId { get; set; } = "";

    public string AuthClientCertThumbprint { get; set; } = "";
}

如何获得AuthClientId属性的Encrypted = True值？

How do I get the value of Encrypted=True on property AuthClientId?

var config = new KeyVaultConfiguration();

// var authClientIdIsEncrypted = ??

在.NET Framework中，这很容易。在.NET CORE中，我认为这是可能的，但是我看不到任何文档。我相信您需要使用System.Reflection，但到底要使用什么方法？

In .NET Framework, this was easy. In .NET CORE, I think this is possible but I don't see any documentation. I believe you need to use System.Reflection but exactly how?

推荐答案

使用System.Reflection添加 ，然后您可以使用 CustomAttributeExtensions.cs 。

Add using System.Reflection and then you may use extension methods from CustomAttributeExtensions.cs.

类似的东西应该对您有用：

Something like this should work for you:

typeof(<class name>).GetTypeInfo()
      .GetProperty(<property name>).GetCustomAttribute<YourAttribute>();

在您的情况下

typeof(KeyVaultConfiguration).GetTypeInfo()
      .GetProperty("AuthClientId").GetCustomAttribute<EncryptedAttribute>();

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