从枚举属性获取枚举 [英] Get enum from enum attribute

问题描述

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).

推荐答案

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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