Question

请参阅代码

DataRow[] rowToUpdate = database1DataSet1.Tables["purchase_invoice"]. 
        Select(string.Format("PuchaseInvoiceId = '{0}' ",cbPurchaseInvoiceId.Text)); 

error' Cannot perform '=' operation on System.Int32 and System.String. 

是否有一个解决办法。

Answer 1

DataRow[] rowToUpdateUpdate = database1DataSet1.Tables["purchase_invoice"].     
      if(cbPurchaseInvoiceId.Text.Trim()!="") 
      Select(string.Format("PuchaseInvoiceId = '{0}' ",cbPurchaseInvoiceId.Text)); 

或

BindingSource bs = new BindingSource(); 
bs.DataSource = database1DataSet1.Tables["purchase_invoice"]; 
private void cbPurchaseInvoiceId_TextChanged(object sender, EventArgs e) 
{ 
    if(cbPurchaseInvoiceId.Text .Trim()!="") 
    bs.Filter = string.Format("PuchaseInvoiceId = '{0}'", int.Parse (txtempname.Text)); 
}