は、私は、テキストボックスにコンボボックスの値を選択して取得する以下のコードを試してみましたが、それは私に次のエラーを与える</p> <p>エラーしている選択されたコンボボックスの値

Question

に応じてテキストボックスの値を変更しますオブジェクト。

コード

private void frmpaymentsearch_Load(object sender, EventArgs e) 
{ 
    txtcomvalue.Text = "PaymentVoucherCode"; 
    dllby.DisplayMember = "Text"; 
    dllby.ValueMember = "Value"; 
    dllby.Items.Add(new { Text = "P.Voucher Code", Value = "PaymentVoucherCode" }); 
    dllby.Items.Add(new { Text = "Vendor", Value = "VendorName" }); 
    dllby.SelectedIndex = 0; 
} 



private void dllby_SelectedIndexChanged(object sender, EventArgs e) 
{ 
    txtcomvalue.Text = dllby.SelectedValue.ToString(); 
} 

Answer 1

ComboBox SelectedItem vs SelectedValue

private void dllby_SelectedIndexChanged(object sender, EventArgs e) 
{ 
     Type myType = dllby.SelectedItem.GetType(); 
     IList<PropertyInfo> props = new List<PropertyInfo>(myType.GetProperties()); 

     foreach (PropertyInfo prop in props) 
     { 
      if(prop.Name=="value") 
       textBox1.Text = prop.GetValue(dllby.SelectedItem, null).ToString(); 
     } 
} 

Answer 2

Dictionary comboSource = new Dictionary(); 
      comboSource.Add("1", "Sunday"); 
      comboSource.Add("2", "Monday"); 
      comboSource.Add("3", "Tuesday"); 
      comboSource.Add("4", "Wednesday"); 
      comboSource.Add("5", "Thursday"); 
      comboSource.Add("6", "Friday"); 
      comboSource.Add("7", "Saturday"); 
      comboBox1.DataSource = new BindingSource(comboSource, null); 
      comboBox1.DisplayMember = "Value"; 
      comboBox1.ValueMember = "Key"; 

Answer 3

private void frmpaymentsearch_Load(object sender, EventArgs e) 
    { 
     txtcomvalue.Text = "PaymentVoucherCode"; 
     dllby.DisplayMember = "Text"; 
     dllby.ValueMember = "Value"; 
     dllby.Items.Add(new { Text = "P.Voucher Code", Value = "PaymentVoucherCode" }); 
     dllby.Items.Add(new { Text = "Vendor", Value = "VendorName" }); 
     dllby.SelectedIndexChanged -= dllby_SelectedIndexChanged; // unsubscribe you event 
     dllby.SelectedIndex = 0; 
     dllby.SelectedIndexChanged += dllby_SelectedIndexChanged; // subscribe you event 
    } 

    private void dllby_SelectedIndexChanged(object sender, EventArgs e) 
    { 
     txtcomvalue.Text = dllby.Text.ToString(); // change selectedvalue to Text 
    } 

Answer 4

private void frmpaymentsearch_Load(object sender, EventArgs e) 
{ 
    txtcomvalue.Text = "PaymentVoucherCode"; 
    dllby.DisplayMember = "Text"; 
    dllby.ValueMember = "Value"; 
    dllby.Items.Add(new ComboboxItem(){ Text = "P.Voucher Code", Value = "PaymentVoucherCode" }); 
    dllby.Items.Add(new ComboboxItem(){ Text = "Vendor", Value = "VendorName" }); 

    dllby.SelectedIndex = 0; 
} 
private void dllby_SelectedIndexChanged(object sender, EventArgs e) 
{ 
    txtcomvalue.Text = (dllby.SelectedItem as ComboboxItem).Value.ToString(); 
} 

public class ComboboxItem 
{ 
    public string Text { get; set; } 
    public string Value { get; set; } 

    public override string ToString() 
    { 
     return Text; 
    } 
}