c# - 在 Devexpress 的 LookupEdit 上显示多列

Question

我有一个绑定(bind)到 LookUpEdit 的 DataSource。例如，我有 2 列 FirstName 和 LastName，我想将 DisplayMember 属性设置为这两列。 我发现我应该订阅 lookUp_CustomDisplayText() 并像这样编辑显示文本属性:

private void lookUpCompanyPerson_CustomDisplayText(object sender, CustomDisplayTextEventArgs e)
{
     LookUpEdit edit = sender as LookUpEdit;

     if (e.DisplayText != "")
     {
           e.DisplayText = e.DisplayText + " " + (string)e.Value;          
     }            
}

但我不明白什么是e.Value，我想为所选行显示另一列，而不是所选行的值成员。

这就是我将数据源绑定(bind)到 lookupedit 的方式:

 private void populateComboBoxForCompanyPerson()
 {
     lookUpCompanyPerson.Properties.ForceInitialize();
     bs = new BindingSource(myDataSet, "CompanyPerson");            
     lookUpCompanyPerson.Properties.DataSource = bs;
     lookUpCompanyPerson.Properties.DisplayMember = "CompanyName";
     lookUpCompanyPerson.Properties.ValueMember = "PersonID";
     this.lookUpCompanyPerson.Properties.Columns.Add(new LookUpColumnInfo("PersonID"));
     this.lookUpCompanyPerson.Properties.Columns["PersonID"].Visible = false;            
     this.lookUpCompanyPerson.Properties.Columns.Add(new LookUpColumnInfo("FirstName"));
     this.lookUpCompanyPerson.Properties.Columns.Add(new LookUpColumnInfo("LastName"));
     this.lookUpCompanyPerson.Properties.Columns.Add(new LookUpColumnInfo("CompanyName"));                
 }

这就是我的数据源的样子:

Answer 1

我稍微更改了 Ian O'Brien 的代码，它可以正常工作:

private void lookUpCompanyPerson_CustomDisplayText(object sender, CustomDisplayTextEventArgs e)
{
      RepositoryItemLookUpEdit props;
      if (sender is LookUpEdit)
      props = (sender as LookUpEdit).Properties;
      else
      props = sender as RepositoryItemLookUpEdit;

      if (props != null && (e.Value is int))
      {
          DataRowView row = props.GetDataSourceRowByKeyValue(e.Value) as DataRowView;

          if (row != null)
          {
              e.DisplayText = String.Format("{0} {1}", row["FirstName"], row["LastName"]);

          }
      }
}