C# 将字符串与枚举匹配？

Match string to enumeration?

提问by user53885

I am using a 3rd party DLL which expects an enumeration called 'DaysOfWeek' in the method signature.

我正在使用第 3 方 DLL，该 DLL 在方法签名中需要一个名为“DaysOfWeek”的枚举。

I am allowing my users to select the day of week from a ComboBox, but I end up with a string.

我允许我的用户从 ComboBox 中选择星期几，但我最终得到了一个字符串。

How can I match my string to the appropriate enumeration property?

如何将我的字符串与适当的枚举属性匹配？

Thanks!

谢谢！

采纳答案by rui

Enum.Parse(typeof(DaysOfWeek), yourStringValue, true);

Note: This will launch an exception if the string is not convertible to the enum. Last parameter is for case insensitive search.

注意：如果字符串不可转换为枚举，这将引发异常。最后一个参数用于不区分大小写的搜索。

回答by Reed Copsey

You can use Enum.Parseto convert the string to the actual Enum.

您可以使用Enum.Parse将字符串转换为实际的 Enum。

回答by LBushkin

You can use the following to convert a string to an enum:

您可以使用以下内容将字符串转换为枚举：

 DaysOfWeek value = (DaysOfWeek)Enum.Parse( typeof(DaysOfWeek), enumAsString );

You can also use the case-insensitive overload if users may type in theor own values:

如果用户可以输入理论或自己的值，您还可以使用不区分大小写的重载：

 DaysOfWeek value = (DaysOfWeek)Enum.Parse( typeof(DaysOfWeek), enumAsString, true );

回答by Jeffrey L Whitledge

You can use the Parse method on the Enum static type.

您可以对 Enum 静态类型使用 Parse 方法。

DaysOfWeek day = (DaysOfWeek)Enum.Parse(typeof(DaysOfWeek), (string)dropDownList.SelectedItem);

Alternatively, you can populate the drop-down-list with enum values directly and avoid the conversion issues entirely.

或者，您可以直接使用枚举值填充下拉列表并完全避免转换问题。

    // Populate combobox.
    foreach (DaysOfWeek day in Enum.GetValues(typeof(DaysOfWeek)))
    {
        daysOfWeekCombo.Items.Add(day);
    }
    // Read combobox.
    DaysOfWeek day = (DaysOfWeek)daysOfWeekCombo.SelectedItem;

回答by Jo?o Angelo

Assuming the combo box contains the enumeration names.

假设组合框包含枚举名称。

ComboBox cb = new ComboBox();

cb.Items.AddRange(Enum.GetNames(typeof(DaysOfWeek));

(DaysOfWeek)Enum.Parse(typeof(DaysOfWeek), cb.SelectedText);

回答by BFree

Create a class that looks something like this:

创建一个看起来像这样的类：

public class DayOfWeekComboBoxItem
{
   public string Day{get;set;}
   public DayOfWeek DayOfWeek{get;set;}

   public override ToString()
   {
      return this.Date;
   }
}

Then bind your combo box to a collection of these items. Then you can cast the SelectedItem in the combo box to an instance of that class.

然后将您的组合框绑定到这些项目的集合。然后，您可以将组合框中的 SelectedItem 转换为该类的实例。

回答by Oliver Friedrich

Sorry for cross-referencing, but in my anser here theres a helper class called EnumPair<T>That you could use to fill the ComboBox and have the value of the enum back to use further on.

很抱歉交叉引用，但在我的 anser 中，有一个名为EnumPair<T>That you can use to fill ComboBox的辅助类，并将枚举的值返回以供进一步使用。

using this three lines will fill the comboBox correctly for you:

使用这三行将为您正确填充组合框：

cbo.DataSource = EnumPair<TEnum>.GetValuePairList();
cbo.ValueMember = EnumPair<TEnum>.ValueMember;
cbo.DisplayMember = EnumPair<TEnum>.DisplayMember;

Here is the original posting

这是原帖

回答by Nathen Silver

If you are populating your ComboBox from the DaysOfWeek enum:

如果您要从 DaysOfWeek 枚举填充 ComboBox：

this.comboBox1.DataSource = Enum.GetValues(typeof(DayOfWeek));

Then you can get the enum value from the SelectedItem property of the ComboBox:

然后你可以从 ComboBox 的 SelectedItem 属性中获取枚举值：

DayOfWeek selected = (DayOfWeek)this.comboBox1.SelectedItem;

回答by Michael Stum

Apart from the other (correct and built-in) suggestions, there is also an interesting Third-Party Enum<T>class that makes working with enums much more nice:

除了其他（正确的和内置的）建议之外，还有一个有趣的第三方Enum<T>类，它使使用枚举变得更好：

http://blog.logrythmik.com/post/Better-Enum-Parsing-using-Strongly-Typed-Generics.aspx

http://blog.logrythmik.com/post/Better-Enum-Parsing-using-Strongly-Typed-Generics.aspx

回答by Joe

You can bind to a list of name/value pairs, where the value is your enum. A bit more work, but will make it easier to support localization down the line if you ever need it. Here's one way:

您可以绑定到名称/值对列表，其中值是您的枚举。需要做更多的工作，但如果您需要，可以更轻松地支持本地化。这是一种方法：

static IList<KeyValuePair<string, DayOfWeek>> GetDayOfWeekBindingList()
{
    List<KeyValuePair<string, DayOfWeek>> dayOfWeekList = new List<KeyValuePair<string, DayOfWeek>>();

    foreach (int day in Enum.GetValues(typeof(DayOfWeek)))
    {
        string dayName = CultureInfo.CurrentCulture.DateTimeFormat.DayNames[day];
        dayOfWeekList.Add(new KeyValuePair<string, DayOfWeek>(dayName, (DayOfWeek)day));
    }
    return dayOfWeekList;
}

private void BindDayOfWeekComboBox()
{
    dayOfWeekComboBox.DisplayMember = "Key";
    dayOfWeekComboBox.ValueMember = "Value";
    dayOfWeekComboBox.DataSource = GetDayOfWeekBindingList();
}

private void Form1_Load(object sender, EventArgs e)
{
    BindDayOfWeekComboBox();
    ...
}

You can then access the day of week as:

然后，您可以通过以下方式访问星期几：

    (DayOfWeek) dayOfWeekComboBox.SelectedValue;