从枚举属性获取枚举
问题说明
我有
public enum Als
{
[StringValue("Beantwoord")] Beantwoord = 0,
[StringValue("Niet beantwoord")] NietBeantwoord = 1,
[StringValue("Geselecteerd")] Geselecteerd = 2,
[StringValue("Niet geselecteerd")] NietGeselecteerd = 3,
}
与
public class StringValueAttribute : Attribute
{
private string _value;
public StringValueAttribute(string value)
{
_value = value;
}
public string Value
{
get { return _value; }
}
}
我想将我从组合框中选择的项目中的值放入一个 int 中:
And I would like to put the value from the item I selected of a combobox into a int:
int i = (int)(Als)Enum.Parse(typeof(Als), (string)cboAls.SelectedValue); //<- WRONG
这可能吗，如果可以，怎么办?(StringValue 匹配从组合框中选择的值).
Is this possible, and if so, how? (the StringValue matches the value selected from the combobox).
正确答案
这里有一个辅助方法，可以为您指明正确的方向.
Here's a helper method that should point you in the right direction.
protected Als GetEnumByStringValueAttribute(string value)
{
Type enumType = typeof(Als);
foreach (Enum val in Enum.GetValues(enumType))
{
FieldInfo fi = enumType.GetField(val.ToString());
StringValueAttribute[] attributes = (StringValueAttribute[])fi.GetCustomAttributes(
typeof(StringValueAttribute), false);
StringValueAttribute attr = attributes[0];
if (attr.Value == value)
{
return (Als)val;
}
}
throw new ArgumentException("The value '" value "' is not supported.");
}
要调用它，只需执行以下操作:
And to call it, just do the following:
Als result = this.GetEnumByStringValueAttribute<Als>(ComboBox.SelectedValue);
这可能不是最好的解决方案，因为它与 Als 相关联，并且您可能希望使此代码可重用.您可能希望从我的解决方案中删除代码以返回属性值，然后在您的问题中使用 Enum.Parse.
This probably isn't the best solution though as it's tied to Als and you'll probably want to make this code re-usable. What you'll probably want to strip out the code from my solution to return you the attribute value and then just use Enum.Parse as you are doing in your question.
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