blocks|key|614353|text|除了需要Cast<int>()和不需要ToList()之外，您的代码是完全正确的。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|614354|entityMap^0|4|B|J|8|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

Your code is exactly correct, except that you need to <code>Cast&lt;int&gt;()</code> and you don't need <code>ToList()</code>.

blocks|key|614456|text|您可以使用以下助手方法为您提供给定角色所允许的一组角色：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|614457|++++private+IEnumerable<RoleName>+AllAllowedRoles(RoleName+level)
++++{
++++++++return+Enum.GetValues(typeof(RoleName)).Cast<RoleName>().Where(role+=>+level+>=+role);
++++}+|code-block|syntax|javascript|614458|然后将它们全部分配给用户。|614459|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|$]]

You can use the following helper method to give you a set of roles allowed for a given role:

<pre><code> private IEnumerable&lt;RoleName&gt; AllAllowedRoles(RoleName level)
 {
 return Enum.GetValues(typeof(RoleName)).Cast&lt;RoleName&gt;().Where(role =&gt; level &gt;= role);
 } 
</code></pre>

And then assign all of them to the user.

blocks|key|829858|text|public+enum+RoleName+:+int
{
++++RegisteredUser+=+7,
++++Moderator+=+8,
++++Administrator+=+9,
++++Owner+=+10
}

+public+List<RoleName>+GetGreaterOrEqual(RoleName+role)
++++{
++++++++List<RoleName>+list+=+new+List<RoleName>();
++++++++foreach+(RoleName+rn+in+Enum.GetValues(typeof(RoleName)))
++++++++{
++++++++++++if(rn+>=+role)
++++++++++++++++list.Add(rn);
++++++++}
++++++++return+list;
++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|829859|你可以在Can+you+loop+through+all+enum+values?上查看这个|unstyled|offset|length|829860|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/972307/can-you-loop-through-all-enum-values-c^0|0|4|11|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@]|9|@$G|S|H|T|1|U]]|A|$]]|$1|I|3|-4|5|F|7|V|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P]]]]

<pre><code>public enum RoleName : int
{
 RegisteredUser = 7,
 Moderator = 8,
 Administrator = 9,
 Owner = 10
}

 public List&lt;RoleName&gt; GetGreaterOrEqual(RoleName role)
 {
 List&lt;RoleName&gt; list = new List&lt;RoleName&gt;();
 foreach (RoleName rn in Enum.GetValues(typeof(RoleName)))
 {
 if(rn &gt;= role)
 list.Add(rn);
 }
 return list;
 }
</code></pre>

You could check this out <a href="https://stackoverflow.com/questions/972307/can-you-loop-through-all-enum-values-c">Can you loop through all enum values?</a>

blocks|key|829936|text|您必须考虑枚举的底层类型。因此：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|829937|static+IEnumerable<T>+Get<T>(T+value)+where+T+:+struct+{
++++Type+underlyingType+=+Enum.GetUnderlyingType(typeof(T));
++++var+compareToMethod+=+underlyingType.GetMethod(
++++++++++++++++++++++++++++++"CompareTo",
++++++++++++++++++++++++++++++new[]+{+underlyingType+}
++++++++++++++++++++++++++);
++++var+values+=+Enum.GetValues(typeof(T));
++++for+(int+index+=+0;+index+<+values.Length;+index%2B%2B)+{
++++++++int+comparison+=+(int)compareToMethod.Invoke(
++++++++++++Convert.ChangeType(value,+underlyingType),
++++++++++++new+object[]+{+values.GetValue(index)+}
++++++++);
++++++++if+(comparison+>=+0)+{
++++++++++++yield+return+(T)values.GetValue(index);
++++++++}
+++++}
+}|code-block|syntax|javascript|829938|我并不想想出一个好名字，但这个方法很管用：|829939|var+largerValues+=+Get<RoleName>(RoleName.Moderator);
foreach(var+largerValue+in+largerValues)+{
++++Console.WriteLine(largerValue);
}|829940|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 have to take into consideration the underlying type of the enum. Thus:

<pre><code>static IEnumerable&lt;T&gt; Get&lt;T&gt;(T value) where T : struct {
 Type underlyingType = Enum.GetUnderlyingType(typeof(T));
 var compareToMethod = underlyingType.GetMethod(
 "CompareTo",
 new[] { underlyingType }
 );
 var values = Enum.GetValues(typeof(T));
 for (int index = 0; index &lt; values.Length; index++) {
 int comparison = (int)compareToMethod.Invoke(
 Convert.ChangeType(value, underlyingType),
 new object[] { values.GetValue(index) }
 );
 if (comparison &gt;= 0) {
 yield return (T)values.GetValue(index);
 }
 }
 }
</code></pre>

I didn't feel like trying to come up with a good name, but this works:

<pre><code>var largerValues = Get&lt;RoleName&gt;(RoleName.Moderator);
foreach(var largerValue in largerValues) {
 Console.WriteLine(largerValue);
}
</code></pre>

blocks|key|829979|text|随之而来的：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|829980|++++public+static+void+AddUserToRole(string+username,+RoleName+level)
++++{
++++++++var+roles+=+RolesLesserThanOrEqualTo(level);

++++++++foreach+(var+role+in+roles)
++++++++{
++++++++++++Roles.AddUserToRole(username,+role.Name());
++++++++}
++++}

++++public+static+IEnumerable<RoleName>+RolesLesserThanOrEqualTo(RoleName+level)
++++{
++++++++return+Enum.GetValues(typeof(RoleName)).Cast<RoleName>().Where(role+=>+level+>=+role);
++++}|code-block|syntax|javascript|829981|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|$]]

went with this:

<pre><code> public static void AddUserToRole(string username, RoleName level)
 {
 var roles = RolesLesserThanOrEqualTo(level);

 foreach (var role in roles)
 {
 Roles.AddUserToRole(username, role.Name());
 }
 }

 public static IEnumerable&lt;RoleName&gt; RolesLesserThanOrEqualTo(RoleName level)
 {
 return Enum.GetValues(typeof(RoleName)).Cast&lt;RoleName&gt;().Where(role =&gt; level &gt;= role);
 }
</code></pre>

I have the following enumeration of membership roles:

<pre><code>public enum RoleName
{
 RegisteredUser,
 Moderator,
 Administrator,
 Owner
}
</code></pre>

I want to be able to fetch all roles greater than or equal to a given role.

For instance I input Administrator and I get an IEnumerable with <code>RoleName.Administration</code> and <code>RoleName.Owner</code>

Something of this sort:

<pre><code>public static void AddUserToRole(string username, RoleName level)
{
 var roles = Enum.GetValues(typeof(RoleName)).Cast&lt;R&gt;().ToList().Where(role =&gt; level &gt; role);

 foreach (var role in roles)
 {
 Roles.AddUserToRole(username, role);
 }
}
</code></pre>

c# Get all enum values greater than a given value?

我有以下成员角色的枚举：public enum RoleName{    RegisteredUser,    Moderator,    Administrator,    Owner}我希望能够获取大于或等于给定角色的所有角色。例如，我输入管理员，然后获得一个包含RoleName.Administration和Ro...

问c#是否获取大于给定值的所有枚举值？
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