获得从枚举属性枚举 [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; }
    }
}

和我想提出的项目我选择了一个组合框成的int值：

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

这是可能的，如果是这样，怎么样？ （在的StringValue 与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

下面是应该指向你在正确的方向上的辅助方法。

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.");
}

和调用它，只要做到以下几点：

And to call it, just do the following:

Als result = this.GetEnumByStringValueAttribute<Als>(ComboBox.SelectedValue);

这可能不是，虽然，因为它是依赖于阿尔斯，你可能会想使这个code可重复使用的最佳解决方案。那么就用什么，你可能会想带出code从我的解决方案来回报你的属性值和 Enum.Parse 为你做你的问题

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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