blocks|key|1672645|text|new+Guid(string)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1672646|您还可以考虑使用TypeConverter。|unstyled|offset|length|style|CODE|1672647|entityMap^0|0|8|D|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|N|8|@$G|O|H|P|I|J]]|9|@]|A|$]]|$1|K|3|-4|5|F|7|Q|8|@]|9|@]|A|$]]]|L|$]]

<pre><code>new Guid(string)
</code></pre>

You could also look at using a <code>TypeConverter</code>.

blocks|key|1672728|text|这将使您非常接近，我在生产中使用它，并且从未发生过冲突。但是，如果您在reflector中查看guid的构造函数，您将看到它所做的所有检查。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1672729|+public+static+bool+GuidTryParse(string+s,+out+Guid+result)
++++{
++++++++if+(!String.IsNullOrEmpty(s)+&&+guidRegEx.IsMatch(s))
++++++++{
++++++++++++result+=+new+Guid(s);
++++++++++++return+true;
++++++++}

++++++++result+=+default(Guid);
++++++++return+false;
++++}

++++static+Regex+guidRegEx+=+new+Regex("%5E[A-Fa-f0-9]{32}$%7C"+%2B
++++++++++++++++++++++++++"%5E({%7C\$)?[A-Fa-f0-9]{8}-([A-Fa-f0-9]{4}-){3}[A-Fa-f0-9]{12}(}%7C\$)?$%7C"+%2B
++++++++++++++++++++++++++"%5E({)?[0xA-Fa-f0-9]{3,10}(,+{0,1}[0xA-Fa-f0-9]{3,6}){2},+{0,1}({)([0xA-Fa-f0-9]{3,4},+{0,1}){7}[0xA-Fa-f0-9]{3,4}(}})$",+RegexOptions.Compiled);|code-block|syntax|javascript|1672730|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|$]]

This will get you pretty close, and I use it in production and have never had a collision. However, if you look at the constructor for a guid in reflector, you will see all of the checks it makes.

<pre><code> public static bool GuidTryParse(string s, out Guid result)
 {
 if (!String.IsNullOrEmpty(s) &amp;&amp; guidRegEx.IsMatch(s))
 {
 result = new Guid(s);
 return true;
 }

 result = default(Guid);
 return false;
 }

 static Regex guidRegEx = new Regex("^[A-Fa-f0-9]{32}$|" +
 "^({|\$)?[A-Fa-f0-9]{8}-([A-Fa-f0-9]{4}-){3}[A-Fa-f0-9]{12}(}|\$)?$|" +
 "^({)?[0xA-Fa-f0-9]{3,10}(, {0,1}[0xA-Fa-f0-9]{3,6}){2}, {0,1}({)([0xA-Fa-f0-9]{3,4}, {0,1}){7}[0xA-Fa-f0-9]{3,4}(}})$", RegexOptions.Compiled);
</code></pre>

blocks|key|1457707|text|如果你想要的是一些非常基本的错误检查，你可以只检查字符串的长度。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1457708|++++++++++++++string+guidStr+=+"";
++++++++++++++if(+guidStr.Length+==+Guid.Empty.ToString().Length+)
+++++++++++++++++Guid+g+=+new+Guid(+guidStr+);|code-block|syntax|javascript|1457709|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|$]]

If all you want is some very basic error checking, you could just check the length of the string.

<pre><code> string guidStr = "";
 if( guidStr.Length == Guid.Empty.ToString().Length )
 Guid g = new Guid( guidStr );
</code></pre>

blocks|key|1457767|text|Guid.TryParse()|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1457768|https://msdn.microsoft.com/de-de/library/system.guid.tryparse(v=vs.110).aspx|unstyled|offset|length|1457769|或|1457770|Guid.TryParseExact()|1457771|https://msdn.microsoft.com/de-de/library/system.guid.tryparseexact(v=vs.110).aspx|1457772|在.NET+4.0+(或3.5?)|1457773|entityMap|0|LINK|mutability|MUTABLE|url|1^0|0|0|24|0|0|0|0|0|29|1|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|Z|8|@]|9|@$G|10|H|11|1|12]]|A|$]]|$1|I|3|J|5|F|7|13|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|14|8|@]|9|@]|A|$B|C]]|$1|M|3|N|5|F|7|15|8|@]|9|@$G|16|H|17|1|18]]|A|$]]|$1|O|3|P|5|F|7|19|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|F|7|1A|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|E]]|X|$5|T|U|V|A|$W|N]]]]

<pre><code>Guid.TryParse()
</code></pre>

<a href="https://msdn.microsoft.com/de-de/library/system.guid.tryparse(v=vs.110).aspx" rel="noreferrer">https://msdn.microsoft.com/de-de/library/system.guid.tryparse(v=vs.110).aspx</a>

or 

<pre><code>Guid.TryParseExact()
</code></pre>

<a href="https://msdn.microsoft.com/de-de/library/system.guid.tryparseexact(v=vs.110).aspx" rel="noreferrer">https://msdn.microsoft.com/de-de/library/system.guid.tryparseexact(v=vs.110).aspx</a>

in .NET 4.0 (or 3.5?)

blocks|key|1457842|text|使用如下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1457843|new+Guid("9D2B0228-4D0D-4C23-8B49-01A698857709")|code-block|syntax|javascript|1457844|您可以设置字符串值，而不是“9D2B0228-4D0D-4C23-8B49-01A698857709|1457845|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

use code like this:

<pre><code>new Guid("9D2B0228-4D0D-4C23-8B49-01A698857709")
</code></pre>

instead of "9D2B0228-4D0D-4C23-8B49-01A698857709" you can set your string value

I did not find the TryParse method for the Guid. I’m wondering how others handle converting a guid in string format into a guid type.

<pre><code>Guid Id;
try
{
 Id = new Guid(Request.QueryString["id"]);
}
catch
{
 Id = Guid.Empty;
}
</code></pre>

How to try convert a string to a Guid

我没有找到Guid的TryParse方法。我想知道其他人是如何将字符串格式的guid转换为guid类型的。Guid Id;try{    Id = new Guid(Request.QueryString["id"]);}catch{    Id = Guid.Empty;}

问如何尝试将字符串转换为Guid
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