blocks|key|1458240|text|[MyAttribute("Hello+World")]
public+int+MyMethod()
{
var+myAttribute+=+GetType().GetMethod("MyMethod").GetCustomAttributes(true).OfType<MyAttribute>().FirstOrDefault();
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1458241|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>[MyAttribute("Hello World")]
public int MyMethod()
{
var myAttribute = GetType().GetMethod("MyMethod").GetCustomAttributes(true).OfType&lt;MyAttribute&gt;().FirstOrDefault();
}
</code></pre>

blocks|key|993391|text|您需要在MethodBase对象上调用GetCustomAttributes函数。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|993392|获取MethodBase对象的最简单方法是调用MethodBase.GetCurrentMethod。(请注意，您应该添加[MethodImpl(MethodImplOptions.NoInlining)])|993393|例如：|993394|MethodBase+method+=+MethodBase.GetCurrentMethod();
MyAttribute+attr+=+(MyAttribute)method.GetCustomAttributes(typeof(MyAttribute),+true)[0]+;
string+value+=+attr.Value;++++//Assumes+that+MyAttribute+has+a+property+called+Value|code-block|syntax|javascript|993395|您也可以手动获取MethodBase，如下所示：(这样会更快)|993396|MethodBase+method+=+typeof(MyClass).GetMethod("MyMethod");|993397|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/dwc6ew1d.aspx|1|http://msdn.microsoft.com/en-us/library/system.reflection.methodbase.getcurrentmethod.aspx^0|4|A|J|J|J|J|0|0|2|A|N|R|1P|16|N|R|1|0|0|0|8|A|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@$9|17|A|18|1|19]]|E|$]]|$1|F|3|G|5|6|7|1A|8|@$9|1B|A|1C|B|C]|$9|1D|A|1E|B|C]|$9|1F|A|1G|B|C]]|D|@$9|1H|A|1I|1|1J]]|E|$]]|$1|H|3|I|5|6|7|1K|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|1L|8|@]|D|@]|E|$M|N]]|$1|O|3|P|5|6|7|1M|8|@$9|1N|A|1O|B|C]]|D|@]|E|$]]|$1|Q|3|R|5|L|7|1P|8|@]|D|@]|E|$M|N]]|$1|S|3|-4|5|6|7|1Q|8|@]|D|@]|E|$]]]|T|$U|$5|V|W|X|E|$Y|Z]]|10|$5|V|W|X|E|$Y|11]]]]

You need to call the <a href="http://msdn.microsoft.com/en-us/library/dwc6ew1d.aspx" rel="noreferrer"><code>GetCustomAttributes</code></a> function on a <code>MethodBase</code> object. 
The simplest way to get the <code>MethodBase</code> object is to call <a href="http://msdn.microsoft.com/en-us/library/system.reflection.methodbase.getcurrentmethod.aspx" rel="noreferrer"><code>MethodBase.GetCurrentMethod</code></a>. (Note that you should add <code>[MethodImpl(MethodImplOptions.NoInlining)]</code>)

For example:

<pre><code>MethodBase method = MethodBase.GetCurrentMethod();
MyAttribute attr = (MyAttribute)method.GetCustomAttributes(typeof(MyAttribute), true)[0] ;
string value = attr.Value; //Assumes that MyAttribute has a property called Value
</code></pre>

You can also get the <code>MethodBase</code> manually, like this: (This will be faster)

<pre><code>MethodBase method = typeof(MyClass).GetMethod("MyMethod");
</code></pre>

blocks|key|248184|text|可用的答案大多是过时的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|248185|这是当前的最佳实践：|248186|class+MyClass
{

++[MyAttribute("Hello+World")]
++public+void+MyMethod()
++{
++++var+method+=+typeof(MyClass).GetRuntimeMethod(nameof(MyClass.MyMethod),+new+Type[]{});
++++var+attribute+=+method.GetCustomAttribute<MyAttribute>();
++}
}|code-block|syntax|javascript|248187|这不需要强制转换，并且使用起来非常安全。|248188|您还可以使用.GetCustomAttributes<T>来获取一种类型的所有属性。|offset|length|style|CODE|248189|entityMap^0|0|0|0|0|6|N|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|W|8|@$M|X|N|Y|O|P]]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

The available answers are mostly outdated. 

This is the current best practice:

<pre><code>class MyClass
{

 [MyAttribute("Hello World")]
 public void MyMethod()
 {
 var method = typeof(MyClass).GetRuntimeMethod(nameof(MyClass.MyMethod), new Type[]{});
 var attribute = method.GetCustomAttribute&lt;MyAttribute&gt;();
 }
}
</code></pre>

This requires no casting and is pretty safe to use.

You can also use <code>.GetCustomAttributes&lt;T&gt;</code> to get all attributes of one type.

blocks|key|1458360|text|如果在构造时将默认属性值存储到属性(在我的示例中为Name)中，则可以使用静态属性帮助器方法：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1458361|using+System;
using+System.Linq;

public+class+Helper
{
++++public+static+TValue+GetMethodAttributeValue<TAttribute,+TValue>(Action+action,+Func<TAttribute,+TValue>+valueSelector)+where+TAttribute+:+Attribute
++++{
++++++++var+methodInfo+=+action.Method;
++++++++var+attr+=+methodInfo.GetCustomAttributes(typeof(TAttribute),+true).FirstOrDefault()+as+TAttribute;
++++++++return+attr+!=+null+?+valueSelector(attr)+:+default(TValue);
++++}
}|code-block|syntax|javascript|1458362|用法：|1458363|var+name+=+Helper.GetMethodAttributeValue<MyAttribute,+string>(MyMethod,+x+=>+x.Name);|1458364|我的解决方案是基于在属性构造时设置默认值，如下所示：|1458365|internal+class+MyAttribute+:+Attribute
{
++++public+string+Name+{+get;+set;+}

++++public+MyAttribute(string+name)
++++{
++++++++Name+=+name;
++++}
}|1458366|entityMap^0|P|4|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|Y|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|10|8|@]|D|@]|E|$]]|$1|Q|3|R|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|S|3|-4|5|6|7|12|8|@]|D|@]|E|$]]]|T|$]]

If you store the default attribute value into a property (<code>Name</code> in my example) on construction, then you can use a static Attribute helper method:

<pre><code>using System;
using System.Linq;

public class Helper
{
 public static TValue GetMethodAttributeValue&lt;TAttribute, TValue&gt;(Action action, Func&lt;TAttribute, TValue&gt; valueSelector) where TAttribute : Attribute
 {
 var methodInfo = action.Method;
 var attr = methodInfo.GetCustomAttributes(typeof(TAttribute), true).FirstOrDefault() as TAttribute;
 return attr != null ? valueSelector(attr) : default(TValue);
 }
}
</code></pre>

Usage:

<pre><code>var name = Helper.GetMethodAttributeValue&lt;MyAttribute, string&gt;(MyMethod, x =&gt; x.Name);
</code></pre>

My solution is based on that the default value is set upon the attribute construction, like this:

<pre><code>internal class MyAttribute : Attribute
{
 public string Name { get; set; }

 public MyAttribute(string name)
 {
 Name = name;
 }
}
</code></pre>

blocks|key|2867350|text|如果你正在实现像上面提到的@Mikael+Engver这样的设置，并允许多次使用。下面是获取所有属性值列表的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2867351|[AttributeUsage(AttributeTargets.Method,+AllowMultiple+=+true)]
public+class+TestCase+:+Attribute
{
++++public+TestCase(string+value)
++++{
++++++++Id+=+value;
++++}

++++public+string+Id+{+get;+}++++++++
}+++

public+static+IEnumerable<string>+AutomatedTests()
{
++++var+assembly+=+typeof(Reports).GetTypeInfo().Assembly;

++++var+methodInfos+=+assembly.GetTypes().SelectMany(m+=>+m.GetMethods())
++++++++.Where(x+=>+x.GetCustomAttributes(typeof(TestCase),+false).Length+>+0);

++++foreach+(var+methodInfo+in+methodInfos)
++++{
++++++++var+ids+=+methodInfo.GetCustomAttributes<TestCase>().Select(x+=>+x.Id);
++++++++yield+return+$"{string.Join(",+",+ids)}+-+{methodInfo.Name}";+//+handle+cases+when+one+test+is+mapped+to+multiple+test+cases.
++++}
}|code-block|syntax|javascript|2867352|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In case you are implementing the setup like @Mikael Engver mentioned above, and allow multiple usage. Here is what you can do to get the list of all the attribute values.

<pre><code>[AttributeUsage(AttributeTargets.Method, AllowMultiple = true)]
public class TestCase : Attribute
{
 public TestCase(string value)
 {
 Id = value;
 }

 public string Id { get; } 
} 

public static IEnumerable&lt;string&gt; AutomatedTests()
{
 var assembly = typeof(Reports).GetTypeInfo().Assembly;

 var methodInfos = assembly.GetTypes().SelectMany(m =&gt; m.GetMethods())
 .Where(x =&gt; x.GetCustomAttributes(typeof(TestCase), false).Length &gt; 0);

 foreach (var methodInfo in methodInfos)
 {
 var ids = methodInfo.GetCustomAttributes&lt;TestCase&gt;().Select(x =&gt; x.Id);
 yield return $"{string.Join(", ", ids)} - {methodInfo.Name}"; // handle cases when one test is mapped to multiple test cases.
 }
}
</code></pre>

blocks|key|993513|text|我使用了这个方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|993514|public+static+TAttributeMember?+GetMethodAttributeValue<TAttribute,+TAttributeMember>(Expression<Func<object>>+property,+Func<TAttribute,+TAttributeMember>+valueSelector)+where+TAttribute+:+Attribute
{
++++var+methodInfo+=+((MemberExpression)property.Body).Member+as+PropertyInfo;
++++var+attr+=+methodInfo?.GetCustomAttributes(typeof(TAttribute),+true).FirstOrDefault()+as+TAttribute;
++++return+attr+!=+null+&&+valueSelector+!=+null+?+valueSelector(attr)+:+default(TAttributeMember);
}|code-block|syntax|javascript|993515|然后可以像这样使用：|993516|var+group+=+GetMethodAttributeValue<FieldAttribs,+FieldGroups>(()+=>+dd.Param2,+a+=>+a.Group);|993517|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I used this method :
<pre><code>public static TAttributeMember? GetMethodAttributeValue&lt;TAttribute, TAttributeMember&gt;(Expression&lt;Func&lt;object&gt;&gt; property, Func&lt;TAttribute, TAttributeMember&gt; valueSelector) where TAttribute : Attribute
{
 var methodInfo = ((MemberExpression)property.Body).Member as PropertyInfo;
 var attr = methodInfo?.GetCustomAttributes(typeof(TAttribute), true).FirstOrDefault() as TAttribute;
 return attr != null &amp;&amp; valueSelector != null ? valueSelector(attr) : default(TAttributeMember);
}
 
</code></pre>
Then can use like this:
<pre><code>var group = GetMethodAttributeValue&lt;FieldAttribs, FieldGroups&gt;(() =&gt; dd.Param2, a =&gt; a.Group);
</code></pre>

I need to be able to read the value of my attribute from within my Method, how can I do that?

<pre><code>[MyAttribute("Hello World")]
public void MyMethod()
{
 // Need to read the MyAttribute attribute and get its value
}
</code></pre>

Read the value of an attribute of a method

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我需要能够从我的方法中读取属性的值，我该怎么做呢？[MyAttribute("Hello World")]public void MyMethod(){    // Need to read the MyAttribute attribute and get its value}

问读取方法的属性值
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