Custom define enum names for combobox

问题

I have a namespace in which I have declared an enum as follows:

namespace IXMSoft.Business.SDK.Data
{
using System;

public enum BaudRate
{
    BR115200 = 7,
    BR19200 = 4,
    BR230400 = 8,
    BR2400 = 1,
    BR38400 = 5,
    BR4800 = 2,
    BR57600 = 6,
    BR9600 = 3
  }
}

When I retrieve these values in a combo box, which is in another namespace, using the statement

comboBox1.Items.Add(BaudRate.BR5700);

it shows the value as for example

"BR5700"

I want to remove BR in front and just want to display the value as "5700". What should I do?

回答1:

use the DescriptionAttribute and an appropriate extension method to read it out.

public enum BaudRate
{
    [Description("115200 kb")]
    BR115200 = 7,
    [Description("19200 kb")]
    BR19200 = 4,
    [Description("230400 kb")]
    BR230400 = 8,
    [Description("2400 kb")]
    BR2400 = 1,
    [Description("115200 kb")]
    BR38400 = 5,
    [Description("4800 kb")]
    BR4800 = 2,
    [Description("57600 kb")]
    BR57600 = 6,
    [Description("9600 kb")]
    BR9600 = 3
}

The extension method:

public static class EnumExtension
{
    /// <summary>
    /// Gets the string of an DescriptionAttribute of an Enum.
    /// </summary>
    /// <param name="value">The Enum value for which the description is needed.</param>
    /// <returns>If a DescriptionAttribute is set it return the content of it.
    /// Otherwise just the raw name as string.</returns>
    public static string Description(this Enum value)
    {
        if (value == null)
        {
            throw new ArgumentNullException("value");
        }

        string description = value.ToString();
        FieldInfo fieldInfo = value.GetType().GetField(description);
        DescriptionAttribute[] attributes =
           (DescriptionAttribute[])
         fieldInfo.GetCustomAttributes(typeof(DescriptionAttribute), false);

        if (attributes != null && attributes.Length > 0)
        {
            description = attributes[0].Description;
        }

        return description;
    }

    /// <summary>
    /// Creates an List with all keys and values of a given Enum class
    /// </summary>
    /// <typeparam name="T">Must be derived from class Enum!</typeparam>
    /// <returns>A list of KeyValuePair&lt;Enum, string&gt; with all available
    /// names and values of the given Enum.</returns>
    public static IList<KeyValuePair<Enum, string>> ToList<T>() where T : struct
    {
        var type = typeof(T);

        if (!type.IsEnum)
        {
            throw new ArgumentException("T must be an enum");
        }

        return (IList<KeyValuePair<Enum, string>>)
                Enum.GetValues(type)
                    .OfType<Enum>()
                    .Select(e => new KeyValuePair<Enum, string>(e, e.Description()))
                    .ToArray();
    }

    public static T GetValueFromDescription<T>(string description) where T : struct
    {
        var type = typeof(T);

        if(!type.IsEnum)
        {
            throw new ArgumentException("T must be an enum");
        }

        foreach(var field in type.GetFields())
        {
            var attribute = Attribute.GetCustomAttribute(field,
                typeof(DescriptionAttribute)) as DescriptionAttribute;

            if(attribute != null)
            {
                if(attribute.Description == description)
                {
                    return (T)field.GetValue(null);
                }
            }
            else
            {
                if(field.Name == description)
                {
                    return (T)field.GetValue(null);
                }
            }
        }

        throw new ArgumentOutOfRangeException("description");
        // or return default(T);
    }
}

At the and you can simply apply this to your combo box by calling:

var list = EnumExtension.ToList<BaudRate>();
myComboBox.DataSource = list;
myComboBox.ValueMember = "Key";
myComboBox.DisplayMember = "Value";

回答2:

Example with string.replace:

BaudRate.BR115200.ToString().Replace("BR","");

Example with substring:

BaudRate.BR115200.ToString().Substring(2);

回答3:

Removing the BR from the enum names seems like the most logical course of action. Given that your enum itself is named BaudRate, the BR is redundant. And given that it is present on every value, it doesn't add any descriptive power to the value name. And given that an enum value is always prefixed by the enum name, the result will always be clear (BaudRate.9600 instead of BaudRate.BR9600).

If you can't/don't want to do this then you need to run a BaudRate.XXX.ToString().Substring(2) on each value before adding in order to remove the first two characters.

回答4:

public enum BaudRate
{
    BR115200 = 7,
    BR19200 = 4,
    BR230400 = 8,
    BR2400 = 1,
    BR38400 = 5,
    BR4800 = 2,
    BR57600 = 6,
    BR9600 = 3
  }
}

foreach (string name in Enum.GetNames(BaudRate))
{
    cmbEnum.Items.Add(name.Replace("BR",""));
}

回答5:

Have your combobox defined like as shown below :

<combobox>
   <ComboBoxItem>--</ComboBoxItem>
   <ComboBoxItem>2400</ComboBoxItem>
   <ComboBoxItem>4800</ComboBoxItem>
   <ComboBoxItem>9600</ComboBoxItem>
   <ComboBoxItem>19200</ComboBoxItem> // and soo on
</combobox>

and bind your Enum to the combobox

来源：https://stackoverflow.com/questions/16767939/custom-define-enum-names-for-combobox