在DataGridView Winform中進行文本框自動完成時出錯

我試圖做這個錯誤specified cast is not validautocomplete對於datagridviewtextboxcell ..我附上了代碼快照以及stack trace。我在這裏錯過了什麼？在DataGridView Winform中進行文本框自動完成時出錯

private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e) 
    { 
     TextBox prodCode = e.Control as TextBox; 
     if (dataGridView1.CurrentCell.ColumnIndex == 0) 
     { 
      var source = new AutoCompleteStringCollection(); 
      String[] stringArray = newDB.CustomerTbls.Where(s => s.Status == "Active" & s.Type == "Customer").Select(s => s.Name).ToArray<string>(); 
      source.AddRange(stringArray); 

      if (prodCode != null) 
      { 
       prodCode.AutoCompleteMode = AutoCompleteMode.SuggestAppend; 
       prodCode.AutoCompleteCustomSource = source; 
       prodCode.AutoCompleteSource = AutoCompleteSource.CustomSource; 

      } 
     } 
     else 
      prodCode.AutoCompleteCustomSource = null; 
    }

DataGridView textbox cell autocomplete code

Stack trace

來源

2012-10-15 Pankaj Nagarsekar

你的問題類似於這個http://stackoverflow.com/q/7225290/122005。你有沒有嘗試移動控件實例TextBox prodCode = e.Control作爲TextBox;在if條件中，在檢查之前它不是null？ – chridam

@chridam：代碼與您指定的鏈接相同。我試着移動控件實例TextBox prodCode = e.Control作爲TextBox;在if條件內，但它仍然給出相同的錯誤。任何其他的消化？ –

我自己想出了這個問題。我試圖做的形式Datagridview Autocomplete是Child Form。我上面發佈的代碼是new Form。所以我打開Child Form作爲一個新的Thread並試圖運行代碼，它的工作！感謝所有幫助@chridam。

來源

2012-10-16 09:53:31

@chridam yup :) –

正如在此線程Problem faced in AutoComplete code for TextBox建議通過decyclone，在一個新的解決方案創建一個新的Windows應用程序項目，創建一個新的形式和嘗試下面的代碼與形式，即創建DataTable行數的大小的String[]，然後將其添加到AutoCompleteStringCollection對象

AutoCompleteStringCollection data = new AutoCompleteStringCollection(); 
data.AddRange(new string[] 
    { 
     "January", 
     "February", 
     "March", 
     "April", 
     "May", 
     "June", 
     "July", 
     "August", 
     "September", 
     "October", 
     "November", 
     "December" 
    }); 

// Create and initialize the text box 
var prodCode = new TextBox 
{ 
    AutoCompleteCustomSource = data, 
    AutoCompleteMode = AutoCompleteMode.SuggestAppend, 
    AutoCompleteSource = AutoCompleteSource.CustomSource, 
    Location = new Point(20, 20), 
    Width = ClientRectangle.Width - 40, 
    Visible = true 
};

看看它是否有效。如果它不起作用，那麼您可以嘗試一種替代解決方案，如AutoCompleteCustomSource – Specified Cast is Not Valid中所述，即用ComboBox代替TextBox，並將其DropDownStyle設置爲DropDown。

來源

2012-10-16 08:27:11 chridam

在DataGridView Winform中進行文本框自動完成時出錯

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