blocks|key|2025240|text|可以将int转换为枚举|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2025241|(MyColour)2|code-block|syntax|javascript|2025242|还有一个选项是Enum.Parse|2025243|(MyColour)Enum.Parse(typeof(MyColour),+"Red")|2025244|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|$]]

You can cast the int to an enum

<pre><code>(MyColour)2
</code></pre>

There is also the option of Enum.Parse

<pre><code>(MyColour)Enum.Parse(typeof(MyColour), "Red")
</code></pre>

blocks|key|2025284|text|您可以使用Enum.Parse从名称中获取枚举值。您可以使用Enum.GetNames遍历所有值，也可以只将一个整数转换为枚举，以从int值获得枚举值。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2025285|例如，如下所示：|2025286|public+MyColours+GetColours(string+colour)
{
++++foreach+(MyColours+mc+in+Enum.GetNames(typeof(MyColours)))+{
++++++++if+(mc.ToString().Contains(colour))+{
++++++++++++return+mc;
++++++++}
++++}
++++return+MyColours.Red;+//+Default+value
}|code-block|syntax|javascript|2025287|或者：|2025288|public+MyColours+GetColours(string+colour)
{
++++return+(MyColours)Enum.Parse(typeof(MyColours),+colour,+true);+//+true+=+ignoreCase
}|2025289|如果未找到该值，则后者将抛出ArgumentException，您可能希望在函数内捕获该值并返回默认值。|2025290|entityMap^0|5|A|U|D|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|11|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|12|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|13|8|@]|D|@]|E|$]]|$1|S|3|-4|5|6|7|14|8|@]|D|@]|E|$]]]|T|$]]

You can use <code>Enum.Parse</code> to get an enum value from the name. You can iterate over all values with <code>Enum.GetNames</code>, and you can just cast an int to an enum to get the enum value from the int value.

Like this, for example:

<pre><code>public MyColours GetColours(string colour)
{
 foreach (MyColours mc in Enum.GetNames(typeof(MyColours))) {
 if (mc.ToString().Contains(colour)) {
 return mc;
 }
 }
 return MyColours.Red; // Default value
}
</code></pre>

or:

<pre><code>public MyColours GetColours(string colour)
{
 return (MyColours)Enum.Parse(typeof(MyColours), colour, true); // true = ignoreCase
}
</code></pre>

The latter will throw an ArgumentException if the value is not found, you may want to catch it inside the function and return the default value.

blocks|key|2025294|text|您所需要的就是Enum.Parse。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2025295|entityMap|0|LINK|mutability|MUTABLE|url|http://msdn.microsoft.com/en-us/library/system.enum.parse.aspx^0|7|A|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

All you need is <a href="http://msdn.microsoft.com/en-us/library/system.enum.parse.aspx" rel="noreferrer">Enum.Parse</a>.

blocks|key|1812063|text|正如在前面的答案中提到的，您可以直接转换为底层数据类型(int+->枚举类型)或解析(string+->枚举类型)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1812064|但是要注意-枚举没有.TryParse，所以在解析过程中需要一个try/catch块来捕获失败。|1812065|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

As mentioned in previous answers, you can cast directly to the underlying datatype (int -> enum type) or parse (string -> enum type).

but beware - there is no .TryParse for enums, so you WILL need a try/catch block around the parse to catch failures.

blocks|key|1812144|text|你可能还想看看这篇博文中的一些建议：My+new+little+friend,+Enum|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1812145|这篇文章描述了一种创建一个非常简单的通用助手类的方法，它使你能够避免Enum.Parse固有的丑陋的强制转换语法-相反，你最终在你的代码中编写了类似这样的东西：|style|CODE|1812146|MyColours+colour+=+Enum<MyColours>.Parse(stringValue);+|code-block|syntax|javascript|1812147|或者查看同一篇文章中的一些评论，这些评论谈到了使用扩展方法来实现类似的功能。|1812148|entityMap|0|LINK|mutability|MUTABLE|url|http://devlicious.com/blogs/christopher_bennage/archive/2007/09/13/my-new-little-friend-enum-lt-t-gt.aspx^0|I|Q|0|0|Y|A|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@$A|X|B|Y|1|Z]]|C|$]]|$1|D|3|E|5|6|7|10|8|@$A|11|B|12|F|G]]|9|@]|C|$]]|$1|H|3|I|5|J|7|13|8|@]|9|@]|C|$K|L]]|$1|M|3|N|5|6|7|14|8|@]|9|@]|C|$]]|$1|O|3|-4|5|6|7|15|8|@]|9|@]|C|$]]]|P|$Q|$5|R|S|T|C|$U|V]]]]

You might also want to check out some of the suggestions in this blog post:
<a href="http://devlicious.com/blogs/christopher_bennage/archive/2007/09/13/my-new-little-friend-enum-lt-t-gt.aspx" rel="nofollow noreferrer">My new little friend, Enum&lt;T&gt;</a>

The post describes a way to create a very simple generic helper class which enables you to avoid the ugly casting syntax inherent with <code>Enum.Parse</code> - instead you end up writing something like this in your code:

<pre><code>MyColours colour = Enum&lt;MyColours&gt;.Parse(stringValue); 
</code></pre>

Or check out some of the comments in the same post which talk about using an extension method to achieve similar.

blocks|key|1812158|text|class+EnumStringToInt+//+to+search+for+a+string+in+enum
{
++++enum+Numbers{one,two,hree};
++++static+void+Main()
++++{
++++++++Numbers+num+=+Numbers.one;+//+converting+enum+to+string
++++++++string+str+=+num.ToString();
++++++++//Console.WriteLine(str);
++++++++string+str1+=+"four";
++++++++string[]+getnames+=+(string[])Enum.GetNames(typeof(Numbers));
++++++++int[]+getnum+=+(int[])Enum.GetValues(typeof(Numbers));
++++++++try
++++++++{
++++++++++++for+(int+i+=+0;+i+<=+getnum.Length;+i%2B%2B)
++++++++++++{
++++++++++++++++if+(str1.Equals(getnames[i]))
++++++++++++++++{
++++++++++++++++++++Numbers+num1+=+(Numbers)Enum.Parse(typeof(Numbers),+str1);
++++++++++++++++++++Console.WriteLine("string+found:{0}",+num1);
++++++++++++++++}
++++++++++++}
++++++++}
++++++++catch+(Exception+ex)
++++++++{
++++++++++++Console.WriteLine("Value+not+found!",+ex);
++++++++}
++++}
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1812159|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>class EnumStringToInt // to search for a string in enum
{
 enum Numbers{one,two,hree};
 static void Main()
 {
 Numbers num = Numbers.one; // converting enum to string
 string str = num.ToString();
 //Console.WriteLine(str);
 string str1 = "four";
 string[] getnames = (string[])Enum.GetNames(typeof(Numbers));
 int[] getnum = (int[])Enum.GetValues(typeof(Numbers));
 try
 {
 for (int i = 0; i &lt;= getnum.Length; i++)
 {
 if (str1.Equals(getnames[i]))
 {
 Numbers num1 = (Numbers)Enum.Parse(typeof(Numbers), str1);
 Console.WriteLine("string found:{0}", num1);
 }
 }
 }
 catch (Exception ex)
 {
 Console.WriteLine("Value not found!", ex);
 }
 }
}
</code></pre>

blocks|key|1812211|text|我将OregonGhost的答案标记为%2B1，然后我尝试使用迭代，并意识到这不是很正确，因为Enum.GetNames返回字符串。你想要Enum.GetValues：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1812212|public+MyColours+GetColours(string+colour)
{++
+++foreach+(MyColours+mc+in+Enum.GetValues(typeof(MyColours)))+
+++if+(mc.ToString()+==+surveySystem)+
++++++return+mc;

+++return+MyColors.Default;
}|code-block|syntax|javascript|1812213|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|$]]

I marked OregonGhost's answer +1, then I tried to use the iteration and realised it wasn't quite right because Enum.GetNames returns strings. You want Enum.GetValues:

<pre><code>public MyColours GetColours(string colour)
{ 
 foreach (MyColours mc in Enum.GetValues(typeof(MyColours))) 
 if (mc.ToString() == surveySystem) 
 return mc;

 return MyColors.Default;
}
</code></pre>

blocks|key|1812219|text|(MyColours)Enum.Parse(typeof(MyColours),+"red",+true);+//+MyColours.Red
(int)((MyColours)Enum.Parse(typeof(MyColours),+"red",+true));+//+0|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1812220|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>(MyColours)Enum.Parse(typeof(MyColours), "red", true); // MyColours.Red
(int)((MyColours)Enum.Parse(typeof(MyColours), "red", true)); // 0
</code></pre>

blocks|key|2025505|text|考虑到.NET+(%2B核心)和C#+7的最新和最大变化，以下是最佳解决方案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2025506|var+ignoreCase+=+true;
Enum.TryParse("red",+ignoreCase+,+out+MyColours+colour);|code-block|syntax|javascript|2025507|颜色变量可以在Enum.TryParse范围内使用|2025508|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|$]]

Given the latest and greatest changes to .NET (+ Core) and C# 7, here is the best solution:

<pre><code>var ignoreCase = true;
Enum.TryParse("red", ignoreCase , out MyColours colour);
</code></pre>

colour variable can be used within the scope of Enum.TryParse

blocks|key|1812288|text|var+color+=++Enum.Parse<Colors>("Green");|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1812289|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>var color = Enum.Parse&lt;Colors&gt;("Green");
</code></pre>

blocks|key|1812317|text|试试这个方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1812318|public+static+class+Helper
{
++public+static+T+FromStr<T>(string+str)+where+T+:+struct,+System.Enum
++++=>+System.Enum.TryParse<T>(value:str,ignoreCase:true,result:out+var+result)
++++?+result
++++:+default;
++public+static+T?+FromStrNull<T>(string+str)+where+T+:+struct,+System.Enum
++++=>+System.Enum.TryParse<T>(value:+str,ignoreCase:+true,result:+out+var+result)
++++?+result
++++:+null;
}|code-block|syntax|javascript|1812319|并像这样使用它|1812320|var+color+=+Helper.FromStr<MyColours>("red");|1812321|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|$]]

Try this method.
<pre><code>public static class Helper
{
 public static T FromStr&lt;T&gt;(string str) where T : struct, System.Enum
 =&gt; System.Enum.TryParse&lt;T&gt;(value:str,ignoreCase:true,result:out var result)
 ? result
 : default;
 public static T? FromStrNull&lt;T&gt;(string str) where T : struct, System.Enum
 =&gt; System.Enum.TryParse&lt;T&gt;(value: str,ignoreCase: true,result: out var result)
 ? result
 : null;
}
</code></pre>
And use it like this
<pre><code>var color = Helper.FromStr&lt;MyColours&gt;(&quot;red&quot;);
</code></pre>

I have an enumeration:

<pre><code>public enum MyColours
{
 Red,
 Green,
 Blue,
 Yellow,
 Fuchsia,
 Aqua,
 Orange
}
</code></pre>

and I have a string:

<pre><code>string colour = "Red";
</code></pre>

I want to be able to return:

<pre><code>MyColours.Red
</code></pre>

from:

<pre><code>public MyColours GetColour(string colour)
</code></pre>

<hr>

So far i have:

<pre><code>public MyColours GetColours(string colour)
{
 string[] colours = Enum.GetNames(typeof(MyColours));
 int[] values = Enum.GetValues(typeof(MyColours));
 int i;
 for(int i = 0; i &lt; colours.Length; i++)
 {
 if(colour.Equals(colours[i], StringComparison.Ordinal)
 break;
 }
 int value = values[i];
 // I know all the information about the matched enumeration
 // but how do i convert this information into returning a
 // MyColour enumeration?
}
</code></pre>

As you can see, I'm a bit stuck. Is there anyway to select an enumerator by value. Something like:

<pre><code>MyColour(2) 
</code></pre>

would result in

<pre><code>MyColour.Green
</code></pre>

Search for a string in Enum and return the Enum

我有一个枚举：public enum MyColours{    Red,    Green,    Blue,    Yellow,    Fuchsia,    Aqua,    Orange}我有一个字符串：string colour = "Red";我希望能够返回：MyColours.Red发自：public ...

问在Enum中搜索字符串并返回Enum
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问在Enum中搜索字符串并返回EnumEN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问在Enum中搜索字符串并返回Enum
EN