blocks|key|4068993|text|到目前为止，我想出的最好的方法是调用一个方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4068994|public+static+class+DebuggerDisplays
{
++++public+static+int+ClaimsPrincipal(IClaimsPrincipal+claimsPrincipal)
++++{
++++++++return+claimsPrincipal.Identities[0].Claims.Count;
++++}
}|code-block|syntax|javascript|4068995|...from监视窗口：|4068996|DebuggerDisplays.ClaimsPrincipal(_thePrincipal),ac+=+10|4068997|该",ac"+suppresses表示“此表达式会产生副作用，不会进行评估”。|offset|length|4068998|但是，请注意，当这超出范围时，Visual+Studio将简单地灰显监视窗口条目，即使带有"，ac“。为了避免这种情况，您需要确保所有内容都是完全限定的，这意味着您将在监视窗口中看到非常长的表达式。|4068999|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/4178647/this-expression-causes-side-effects-and-will-not-be-evaluated-how-to-suppress^0|0|0|0|0|1|G|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|12|8|@]|9|@$M|13|N|14|1|15]]|A|$]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

The best I've come up with so far is to call a method:

<pre><code>public static class DebuggerDisplays
{
 public static int ClaimsPrincipal(IClaimsPrincipal claimsPrincipal)
 {
 return claimsPrincipal.Identities[0].Claims.Count;
 }
}
</code></pre>

...from the watch window:

<pre><code>DebuggerDisplays.ClaimsPrincipal(_thePrincipal),ac = 10
</code></pre>

The <a href="https://stackoverflow.com/questions/4178647/this-expression-causes-side-effects-and-will-not-be-evaluated-how-to-suppress">",ac" suppresses</a> the "This expression causes side effects and will not be evaluated".

However, note that when this goes out of scope, Visual Studio will simply grey out the watch window entry, even with the ",ac". To avoid this, you'll need to ensure that everything is fully qualified, which means that you'll end up with extremely long expressions in the watch window.

blocks|key|494976|text|我自己也有很多次同样的需求，所以我在我与人合著的商业工具"BugAid“中创建了一个名为Custom+Expressions的功能。使用它，右键单击值，选择“添加自定义表达式”，然后键入它：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|494977|​|494978|📷|atomic|494979|494980|注意，您甚至可以为表达式输入一个友好的名称，即"Amount+of+Claims"：|494981|输入自定义表达式后，无论何时将鼠标悬停在变量上，都可以看到其结果：|494982|494983|494984|494985|entityMap|0|LINK|mutability|MUTABLE|url|http://www.bugaidsoftware.com/|1|http://www.bugaidsoftware.com/features/#custom|2|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/84fdda9af418a1714ec50012d9fc7c71.png|imageAlt|3|https://ask.qcloudimg.com/http-save/yehe-900000/40a9c35aca9a718865e6a78d2ad9385e.png^0|T|6|0|18|I|1|0|0|0|1|2|0|0|0|0|0|0|1|3|0|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@$A|19|B|1A|1|1B]|$A|1C|B|1D|1|1E]]|C|$]]|$1|D|3|E|5|6|7|1F|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|1G|8|@]|9|@$A|1H|B|1I|1|1J]]|C|$]]|$1|I|3|E|5|6|7|1K|8|@]|9|@]|C|$]]|$1|J|3|K|5|6|7|1L|8|@]|9|@]|C|$]]|$1|L|3|M|5|6|7|1M|8|@]|9|@]|C|$]]|$1|N|3|E|5|6|7|1N|8|@]|9|@]|C|$]]|$1|O|3|G|5|H|7|1O|8|@]|9|@$A|1P|B|1Q|1|1R]]|C|$]]|$1|P|3|E|5|6|7|1S|8|@]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|1T|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]|Y|$5|T|U|V|C|$W|Z]]|10|$5|11|U|12|C|$13|14|15|-4]]|16|$5|11|U|12|C|$13|17|15|-4]]]]

I had the same need many times myself, and so I created a feature called <a href="http://www.bugaidsoftware.com/features/#custom" rel="nofollow noreferrer">Custom Expressions</a> in a commercial tool I co-authored called "<a href="http://www.bugaidsoftware.com" rel="nofollow noreferrer">BugAid</a>". With it, you right click the value, choose "Add Custom Expression", and then type it in: 

<img src="https://i.stack.imgur.com/Qu5kK.png" alt="Custom Expression">

Note you can even enter in a friendly name for the expression, ie, "Amount of Claims":

Once you enter a custom expression, you'll be able to see its result whenever you hover over the variable:

<img src="https://i.stack.imgur.com/p33NU.png" alt="Custom Expression 2 ">

blocks|key|4069126|text|应用于KeyValuePair的仅显示值成员的DebuggerTypeProxyAttribute示例：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4069127|using+System.Collections.Generic;
using+System.Diagnostics;

[assembly:+DebuggerTypeProxy(typeof(ConsoleApp2.KeyValuePairDebuggerTypeProxy<,>),+Target+=+typeof(KeyValuePair<,>))]
//+alternative+format+[assembly:+DebuggerTypeProxy(typeof(ConsoleApp2.KeyValuePairDebuggerTypeProxy<,>),+TargetTypeName+=+"System.Collections.Generic.KeyValuePair`2")]

namespace+ConsoleApp2
{
++++class+KeyValuePairDebuggerTypeProxy<TKey,+TValue>
++++{
++++++++private+KeyValuePair<TKey,+TValue>+_keyValuePair;+//+beeing+non-public+this+member+is+hidden
++++++++//public+TKey+Key+=>+_keyValuePair.Key;
++++++++public+TValue+Value+=>+_keyValuePair.Value;

++++++++public+KeyValuePairDebuggerTypeProxy(KeyValuePair<TKey,+TValue>+keyValuePair)
++++++++{
++++++++++++_keyValuePair+=+keyValuePair;
++++++++}
++++}

++++class+Program
++++{
++++++++static+void+Main(string[]+args)
++++++++{
++++++++++++var+dictionary+=+new+Dictionary<int,+string>()+{+[1]+=+"one",+[2]+=+"two"+};
++++++++++++Debugger.Break();
++++++++}
++++}
}|code-block|syntax|javascript|4069128|​|4069129|📷|atomic|4069130|4069131|在Visual+Studio+2017上测试|4069132|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/d8eyd8zc.aspx|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/bd7207a61b4ec4ea2d8892f04df71077.png|imageAlt^0|N|Q|0|0|0|0|0|1|1|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@$A|15|B|16|1|17]]|C|$]]|$1|D|3|E|5|F|7|18|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|19|8|@]|9|@]|C|$]]|$1|K|3|L|5|M|7|1A|8|@]|9|@$A|1B|B|1C|1|1D]]|C|$]]|$1|N|3|J|5|6|7|1E|8|@]|9|@]|C|$]]|$1|O|3|P|5|6|7|1F|8|@]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|1G|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]|Y|$5|Z|U|10|C|$11|12|13|-4]]]]

Example of <a href="http://msdn.microsoft.com/en-us/library/d8eyd8zc.aspx" rel="nofollow noreferrer">DebuggerTypeProxyAttribute</a> applied to KeyValuePair showing only the Value member:

<pre><code>using System.Collections.Generic;
using System.Diagnostics;

[assembly: DebuggerTypeProxy(typeof(ConsoleApp2.KeyValuePairDebuggerTypeProxy&lt;,&gt;), Target = typeof(KeyValuePair&lt;,&gt;))]
// alternative format [assembly: DebuggerTypeProxy(typeof(ConsoleApp2.KeyValuePairDebuggerTypeProxy&lt;,&gt;), TargetTypeName = "System.Collections.Generic.KeyValuePair`2")]

namespace ConsoleApp2
{
 class KeyValuePairDebuggerTypeProxy&lt;TKey, TValue&gt;
 {
 private KeyValuePair&lt;TKey, TValue&gt; _keyValuePair; // beeing non-public this member is hidden
 //public TKey Key =&gt; _keyValuePair.Key;
 public TValue Value =&gt; _keyValuePair.Value;

 public KeyValuePairDebuggerTypeProxy(KeyValuePair&lt;TKey, TValue&gt; keyValuePair)
 {
 _keyValuePair = keyValuePair;
 }
 }

 class Program
 {
 static void Main(string[] args)
 {
 var dictionary = new Dictionary&lt;int, string&gt;() { [1] = "one", [2] = "two" };
 Debugger.Break();
 }
 }
}
</code></pre>

<a href="https://i.stack.imgur.com/3ltpf.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/3ltpf.png" alt="enter image description here"></a>

Tested on Visual Studio 2017

I've got an <code>IClaimsPrincipal</code> variable, and I'd like to see how many claims are in it. Navigating through the properties in the watch window is complicated, so I'd like to customize how this object is displayed.

I'm aware of the <a href="http://msdn.microsoft.com/en-us/library/system.diagnostics.debuggertypeproxyattribute.aspx" rel="nofollow"><code>[DebuggerTypeProxy]</code> attribute</a>, which initially looked like it might do what I want. Unfortunately, it needs to be attached to the class, and I don't "own" the class. In this case it's a <code>Microsoft.IdentityModel.Claims.ClaimsPrincipal</code>.

I'd like to display the value of <code>IClaimsPrincipal.Identities[0].Claims.Count</code>.

Is there any way, using <code>[DebuggerTypeProxy]</code> or similar, to customize how the value of a type that I don't own is displayed in the watch window?

Can I use something like DebuggerTypeProxyAttribute on a type that I don't own?

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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我有一个IClaimsPrincipal变量，我想看看其中有多少个声明。浏览监视窗口中的属性很复杂，因此我想自定义此对象的显示方式。我知道，它最初看起来可以做我想要的事情。不幸的是，它需要附加到类中，而我并不“拥有”这个类。在本例中，它是一个Microsoft.IdentityModel.Claims.ClaimsPr...

问我可以在我不拥有的类型上使用像DebuggerTypeProxyAttribute这样的东西吗？
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问我可以在我不拥有的类型上使用像DebuggerTypeProxyAttribute这样的东西吗？EN