C＃綁定源控件

Question

我正在開發一個winforms應用程序。我有兩個datagrid視圖從兩個不同的綁定資源（控制）填充。我正在使用這些來實現主細節方法。我的問題是，當使用綁定源填充第一個datagridview時，我無法選擇它的第一行，因爲綁定源中的第一個元素是默認選擇的，無法選擇。任何人都可以爲我提供解決方案

Answer 1

正如你所說，第一行是默認選中的。因此，在將DataSource填充到第一個GridView後，可以基於第一個條目設置第二個GridView。稍後，您會檢查selectionChanged事件以基於第一個GridView的selectedRow填充第二個GridView。

代碼可能看起來像。像這樣：

private void PopulateDataSource() 
{ 
    dataGridView1.DataSource = myBindingSource; 

    DataRowView selectedRow; 
    if (dataGridView1.SelectedRows.Count > 0) 
     selectedRow = dataGridView1.SelectedRows[0] as DataRowView; 

    if (selectedRow != null) 
     dataGridView2.DataSource = myBindingSource2; //Set the BindingSource based on selectedRow in first Grid 

} 

private void dataGridView1_SelectionChanged(object sender, EventArgs e) 
{ 
    DataRowView selectedRow; 
    if (dataGridView1.SelectedRows.Count > 0) 
     selectedRow = dataGridView1.SelectedRows[0] as DataRowView; 

    if (selectedRow != null) 
     dataGridView2.DataSource = myBindingSource2; //Set the BindingSource based on selectedRow in first Grid 
} 

如果這不起作用，讓我知道，但應該做的工作。

UDPATE

下面是一個使用事件和BindingSource的方法類似的例子：

private void Initialize() 
{ 
    RegisterBindingSourceEvents(); 
    dataGridView1.DataSource = bindingSource1; 
    dataGridView2.DataSource = bindingSource2; 
    bindingSource1.DataSource = myDataSource; 
} 

private void RegisterBindingSourceEvents() 
{ 
    bindingSource1.DataSourceChanged += BindingSource1_DataSourceChanged; 
    bindingSource1.CurrentChanged += BindingSource1_CurrentChanged; 
} 

private void BindingSource1_CurrentChanged(object sender, EventArgs e) 
{ 
    DataRowView row = bindingSource1.Current as DataRowView; 
    if (row != null) 
     bindingSource2.DataSource = myDataSource2BasedOnRow; 
} 

private void BindingSource1_DataSourceChanged(object sender, EventArgs e) 
{ 
    DataRowView row = bindingSource1.Current as DataRowView; 
    if (row != null) 
     bindingSource2.DataSource = myDataSource2BasedOnRow; 
} 

而且你也許可以使用：

bindingSource.MoveNext(); 
bindingSource.MoveFirst(); 

爲了模擬重點Seconde系列排並直接排在第一排。有點醜，但我猜想這會觸發current_changed（未經測試）。更好地使用第一種方法

UDPATE-2

我很遺憾地告訴你，這是不可能在一個美麗的方式。問題是，如果您的DataSource包含項目，那麼您的bindingList的Current屬性總是被設置。所以如果用戶選擇與bindingSource相同的行當前屬性包含你的事件不會被調用。我找到了一個適用於我的例子的解決方案。你需要一個gridEvent，也許必須做一些改進，但這個想法應該能夠完成這項工作。對不起，但沒有gridEvent我不能解決這個問題：

請注意，iam使用列表作爲我的測試用例的數據源。你有DataTable，並且必須強制轉換爲DataRowView而不是Dummy。

private bool _automatedRowChange; 

     private void Initialize() 
     { 
      List<Dummy> dummies = new List<Dummy> { new Dummy { Id = 1, Text = "Test1" }, new Dummy { Id = 2, Text = "Test2" } }; 
      bindingSource1.DataSource = dummies; 
      dataGridView1.DataSource = bindingSource1; 

      //So the first row isn't focused but the bindingSource Current Property still holds the first entry 
      //That's why it won't fire currentChange even if you click the first row. Just looks better for the user i guess 
      dataGridView1.ClearSelection(); 

      bindingSource1.CurrentChanged += BindingSource1_CurrentChanged; 
      dataGridView1.CellClick += DataGridView1_CellClick; 
     } 

     private void DataGridView1_CellClick(object sender, DataGridViewCellEventArgs e) 
     { 
      var clickedRow = dataGridView1.Rows[e.RowIndex].DataBoundItem as Dummy; 
      var currentRow = bindingSource1.Current as Dummy; 

      if (clickedRow != null && 
       currentRow != null && 
       clickedRow.Equals(currentRow)) 
      { 
       _automatedRowChange = true; 
       bindingSource1.MoveNext(); 

       _automatedRowChange = false; //MovePrevious is based on the click and should load the dataSource2 
       bindingSource1.MovePrevious(); 
      } 
     } 

     private void BindingSource1_CurrentChanged(object sender, EventArgs e) 
     { 
      if (!_automatedRowChange) //Check if you jump to next item automatically so you don't load dataSource2 in this case 
      { 
       //Set the second DataSource based on selectedRow 
      } 
     }