我有一个这样的枚举结构:
public enum EnumDisplayStatus
{
None = 1,
Visible = 2,
Hidden = 3,
MarkedForDeletion = 4
}
在我的数据库中，枚举是按值引用的。我的问题是，如何将枚举的数字表示转换回字符串名称。
例如，给定2，结果应该是可见的。
当前回答
解决方案:
int enumValue = 2; // The value for which you want to get string
string enumName = Enum.GetName(typeof(EnumDisplayStatus), enumValue);
同样，使用GetName比显式转换Enum更好。
[性能基准代码]
Stopwatch sw = new Stopwatch (); sw.Start (); sw.Stop (); sw.Reset ();
double sum = 0;
int n = 1000;
Console.WriteLine ("\nGetName method way:");
for (int i = 0; i < n; i++) {
sw.Start ();
string t = Enum.GetName (typeof (Roles), roleValue);
sw.Stop ();
sum += sw.Elapsed.TotalMilliseconds;
sw.Reset ();
}
Console.WriteLine ($"Average of {n} runs using Getname method casting way: {sum / n}");
Console.WriteLine ("\nExplicit casting way:");
for (int i = 0; i < n; i++) {
sw.Start ();
string t = ((Roles)roleValue).ToString ();
sw.Stop ();
sum += sw.Elapsed.TotalMilliseconds;
sw.Reset ();
}
Console.WriteLine ($"Average of {n} runs using Explicit casting way: {sum / n}");
(样本结果)
GetName method way:
Average of 1000 runs using Getname method casting way: 0.000186899999999998
Explicit casting way:
Average of 1000 runs using Explicit casting way: 0.000627900000000002
其他回答
考虑到:
enum Colors {
Red = 1,
Green = 2,
Blue = 3
};
在。net 4.7中
Console.WriteLine( Enum.GetName( typeof(Colors), Colors.Green ) );
Console.WriteLine( Enum.GetName( typeof(Colors), 3 ) );
将显示
Green
Blue
在。net 6中，上述方法仍然有效，但是:
Console.WriteLine( Enum.GetName( Colors.Green ) );
Console.WriteLine( Enum.GetName( (Colors)3 ) );
将显示:
Green
Blue
试试这个:
string m = Enum.GetName(typeof(MyEnumClass), value);
解决方案:
int enumValue = 2; // The value for which you want to get string
string enumName = Enum.GetName(typeof(EnumDisplayStatus), enumValue);
同样，使用GetName比显式转换Enum更好。
[性能基准代码]
Stopwatch sw = new Stopwatch (); sw.Start (); sw.Stop (); sw.Reset ();
double sum = 0;
int n = 1000;
Console.WriteLine ("\nGetName method way:");
for (int i = 0; i < n; i++) {
sw.Start ();
string t = Enum.GetName (typeof (Roles), roleValue);
sw.Stop ();
sum += sw.Elapsed.TotalMilliseconds;
sw.Reset ();
}
Console.WriteLine ($"Average of {n} runs using Getname method casting way: {sum / n}");
Console.WriteLine ("\nExplicit casting way:");
for (int i = 0; i < n; i++) {
sw.Start ();
string t = ((Roles)roleValue).ToString ();
sw.Stop ();
sum += sw.Elapsed.TotalMilliseconds;
sw.Reset ();
}
Console.WriteLine ($"Average of {n} runs using Explicit casting way: {sum / n}");
(样本结果)
GetName method way:
Average of 1000 runs using Getname method casting way: 0.000186899999999998
Explicit casting way:
Average of 1000 runs using Explicit casting way: 0.000627900000000002
获取String值[Name]:
EnumDisplayStatus enumDisplayStatus = (EnumDisplayStatus)GetDBValue();
string stringValue = $"{enumDisplayStatus:G}";
和获取enum值:
string stringValue = $"{enumDisplayStatus:D}";
SetDBValue(Convert.ToInt32(stringValue ));
只需要:
string stringName = EnumDisplayStatus.Visible.ToString("f");
// stringName == "Visible"
