数据绑定枚举属性到网格和显示描述 [英] Data bind enum properties to grid and display description

问题描述

这是类似于如何绑定的问题对于DataGrid 的定制枚举描述，但在我的情况下，我有多个属性。

This is a similar question to How to bind a custom Enum description to a DataGrid, but in my case I have multiple properties.

public enum ExpectationResult
{
    [Description("-")]
    NoExpectation,

    [Description("Passed")]
    Pass,

    [Description("FAILED")]
    Fail
}

public class TestResult
{
    public string TestDescription { get; set; }
    public ExpectationResult RequiredExpectationResult { get; set; }
    public ExpectationResult NonRequiredExpectationResult { get; set; }
}

我绑定了一个BindingList< TestResult>到WinForms DataGridView（实际上是一个DevExpress.XtraGrid.GridControl，但一般的解决方案将更广泛地适用）。我想要描述而不是枚举名称。我该如何做到这一点？ （类/枚举/属性没有约束;我可以随意改变它们。）

I'm binding a BindingList<TestResult> to a WinForms DataGridView (actually a DevExpress.XtraGrid.GridControl, but a generic solution would be more widely applicable). I want the descriptions to appear rather than the enum names. How can I accomplish this? (There are no constraints on the class/enum/attributes; I can change them at will.)

推荐答案

A TypeConverter 通常会做这个工作;这里有一些适用于 DataGridView 的代码 - 只需添加代码来读取描述（通过反思等） - 我刚刚使用字符串前缀来显示自定义代码工作）。

A TypeConverter will usually do the job; here's some code that works for DataGridView - just add in your code to read the descriptions (via reflection etc - I've just used a string prefix for now to show the custom code working).

请注意，您可能也想覆盖 ConvertFrom 。转换器可以在类型为或的属性级别（如果您只想要应用于某些属性）中指定，也可以在运行时应用枚举不受您的控制。

Note you would probably want to override ConvertFrom too. The converter can be specified at the type or the property level (in case you only want it to apply for some properties), and can also be applied at runtime if the enum isn't under your control.

using System.ComponentModel;
using System.Windows.Forms;
[TypeConverter(typeof(ExpectationResultConverter))]
public enum ExpectationResult
{
    [Description("-")]
    NoExpectation,

    [Description("Passed")]
    Pass,

    [Description("FAILED")]
    Fail
}

class ExpectationResultConverter : EnumConverter
{
    public ExpectationResultConverter()
        : base(
            typeof(ExpectationResult))
    { }

    public override object ConvertTo(ITypeDescriptorContext context,
        System.Globalization.CultureInfo culture, object value,
        System.Type destinationType)
    {
        if (destinationType == typeof(string))
        {
            return "abc " + value.ToString(); // your code here
        }
        return base.ConvertTo(context, culture, value, destinationType);
    }
}

public class TestResult
{
    public string TestDescription { get; set; }
    public ExpectationResult RequiredExpectationResult { get; set; }
    public ExpectationResult NonRequiredExpectationResult { get; set; }

    static void Main()
    {
        BindingList<TestResult> list = new BindingList<TestResult>();
        DataGridView grid = new DataGridView();
        grid.DataSource = list;
        Form form = new Form();
        grid.Dock = DockStyle.Fill;
        form.Controls.Add(grid);
        Application.Run(form);
    }
}

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