DataGridViewComboBoxColumn DataSource？

Question

我正试图在DataGridView中设置一些东西。这看起来应该很简单，但我有麻烦了。我想显示三列：

• CodeID
• CodeName
• ComboBox with DisplayMember of TypeName，ValueMember of TypeID

我希望能够从所有可能的TypeName值中进行选择。这是我的困境：

如果我将所有这些加载到一个DataTable中，并将DataGridView设置为DataSource，则可以显示该记录的现有TypeName，但是组合框将不包含任何其他值。如果我将DataGridViewComboBoxColumn的DataGridViewComboBoxColumn设置为包含所有可能的TypeNames的单独DataTable，则不会显示现有的值。

DataGridView使用起来真的很烦人，所以最好有一个解决方案，或者一个可行的替代方案。

编辑:这个问题似乎是因为我想要一个单独的项目为DisplayMember和ValueMember。如果我不担心将ID设置为ValueMember，下面的工作是可行的

var typeColumn = new DataGridViewComboBoxColumn
{
    DataSource = typeList,
    DisplayMember = "Type",
    ValueMember = "Type",
    DataPropertyName = "Type"
}

如果执行以下操作，将选择正确的类型，但无法更改组合框中的选择：

var typeColumn = new DataGridViewComboBoxColumn
{
    DataSource = typeList,
    DisplayMember = "Type",
    ValueMember = "TypeID",
    DataPropertyName = "TypeID"
}

如果使用以下内容，将得到一个FormatException错误，因为它试图填充：

var typeColumn = new DataGridViewComboBoxColumn
{
    DataSource = typeList,
    DisplayMember = "Type",
    ValueMember = "TypeID",
    DataPropertyName = "Type"
}

编辑：typeList是由以下内容填充的简单DataTable：

SELECT DISTINCT IT.InsuranceTypeID, IT.[Type]
FROM InsuranceType IT
WHERE IT.ClientID = @ClientID
ORDER BY [Type]

Answer 1

好的，我想出了一个例子ClientInfo和InsuranceDetails，我认为它们可能模仿你想要做的事情。如果这些细节不完全正确，请告诉我。此示例将填充DataGridViewComboBox并根据InsuranceDetails设置值(特别是at：InsurDetailz = all_insurance_types[2])。

   public partial class Form1 : Form
   {
      private ClientInfo _myClient;
      private BindingList<InsuranceDetails> all_insurance_types =
         new BindingList<InsuranceDetails>();

      public Form1()
      {
         InitializeComponent();

         DataGridView grid = new DataGridView();
         grid.Dock = DockStyle.Fill;
         grid.AutoGenerateColumns = true;

         all_insurance_types.Add(new InsuranceDetails(1, "Health"));
         all_insurance_types.Add(new InsuranceDetails(2, "Home"));
         all_insurance_types.Add(new InsuranceDetails(3, "Life"));

         var col = new DataGridViewComboBoxColumn
         {
            DataSource = all_insurance_types,
            HeaderText = "Insurance Type",
            DataPropertyName = "InsurDetailz",
            DisplayMember = "ItType",
            ValueMember = "Self",
         };

         _myClient = new ClientInfo { 
            InsurDetailz = all_insurance_types[2], Name = "Jimbo" };
         grid.Columns.Add(col);
         grid.DataSource = new BindingList<ClientInfo> { _myClient };
         this.Controls.Add(grid);

         this.FormClosing += new FormClosingEventHandler(Form1_FormClosing);
      }

      void Form1_FormClosing(object sender, FormClosingEventArgs e)
      {
         // make sure its updated
         InsuranceDetails c = _myClient.InsurDetailz;
         string name = _myClient.Name;
         // Place breakpoint here to see the changes in _myClient 
         throw new NotImplementedException();
      }
   }

   class ClientInfo
   {
      public string Name { get; set; }
      public InsuranceDetails InsurDetailz { get; set; }
   }

   class InsuranceDetails
   {
      public int InsuranceTypeID { get; set; }
      public String ItType { get; set; }
      public InsuranceDetails Self { get { return this; } }

      public InsuranceDetails(int typeId, String itType)
      {
         this.InsuranceTypeID = typeId;
         this.ItType = itType;
      }
   }

Answer 2

我有一个类似的问题(我认为)，我的解决方案是为DataGridViewComboBoxColumn 设置DataGridViewComboBoxColumn，然后为DataGridView设置DataSource。

在我的例子中，我的DataSources分别是一个List<T>和一个BindingList<T>，但是它应该与DataTables一样工作：

DataGridViewComboBoxColumn categoryColumn = (DataGridViewComboBoxColumn)_ItemsGrid.Columns["CategoryID"];
categoryColumn.DataSource = categories;

_ItemsGrid.DataSource = items;