如何将枚举转换为Winforms中DataBinding的bo​​ol？ [英] How to convert enum to a bool for DataBinding in Winforms?

问题描述

是否可以这样做？我需要使用：

Is it possible to do this? I need to use:

this.ControlName.DataBindings.Add (...)

所以我无法定义逻辑，而不是将我的枚举值绑定到code> bool 。

so I can't define logic other than bind my enum value to a bool.

例如：

(DataClass) Data.Type (enum)

编辑：

我需要绑定 Data.Type 这是一个枚举到复选框的已检查财产。所以如果 Data.Type 是 Secure ，我想要 SecureCheckbox 通过数据绑定进行检查。

I need to bind Data.Type which is an enum to a checkbox's Checked property. So if the Data.Type is Secure, I want the SecureCheckbox to be checked, through data binding.

推荐答案

Winforms绑定生成两个重要且有用的事件：格式和解析。

Winforms binding generates two important and useful events: Format and Parse.

当将数据从源数据拉入到控件中时，格式事件触发，当将数据从控件拉回数据源时，Parse事件触发。

The format event fires when pulling data from a source into a control and the Parse event fires when pulling data from a control back into the data source.

如果您处理这些事件，您可以在绑定期间更改/重新输入值。

If you handle these events you can alter/retype the values going back and forth during binding.

例如，这里有一对这些事件的示例处理程序：

For example here are a couple of example handlers for these events:

 public static void StringValuetoEnum<T>(object sender, ConvertEventArgs cevent)
 {
      T type = default(T);
      if (cevent.DesiredType != type.GetType()) return;
      cevent.Value = Enum.Parse(type.GetType(), cevent.Value.ToString());
 }

 public static void EnumToStringValue<T>(object sender, ConvertEventArgs cevent)
 {
      //if (cevent.DesiredType != typeof(string)) return;
      cevent.Value = ((int)cevent.Value).ToString();
 }

这里是附加这些事件处理程序的一些代码：

And here is some code attaching these event handlers:

 List<NameValuePair> bts = EnumHelper.EnumToNameValuePairList<LegalEntityType>(true, null);
 this.cboIncType.DataSource = bts;                
 this.cboIncType.DisplayMember = "Name";
 this.cboIncType.ValueMember = "Value";

 Binding a = new Binding("SelectedValue", this.ActiveCustomer.Classification.BusinessType, "LegalEntityType");
 a.Format += new ConvertEventHandler(ControlValueFormatter.EnumToStringValue<LegalEntityType>);
 a.Parse += new ConvertEventHandler(ControlValueFormatter.StringValuetoEnum<LegalEntityType>);
 this.cboIncType.DataBindings.Add(a);

所以在你的情况下，你可以为格式事件创建一个SecEnum到Bool处理程序，像：

So in your case you can just create a SecEnum to Bool handler for the format event and within that do something like:

 SecEnum se = Enum.Parse(typeof(SecEnum), cevent.Value.ToString());
 cevent.Value = (bool)(se== SecEnum.Secure);

，然后在解析过程中相反。

and then reverse that during parse.

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