更改事件內的文本框值？

Question

當發生此事件時，我有掃描儀事件我有代碼保存我通過掃描儀將其讀入文本框的內容。

當我跟蹤這是工作不錯，但沒有顯示用戶

此代碼按鈕點擊裏面的屏幕上：

protected void Button1_Click(object sender, EventArgs e) 
    { 
     try 
     { 
      //Instantiate CoreScanner Class 
      cCoreScannerClass = new CCoreScannerClass(); 
      //Call Open API 
      short[] scannerTypes = new short[1];//Scanner Types you are interested in 
      scannerTypes[0] = 1; // 1 for all scanner types 
      short numberOfScannerTypes = 1; // Size of the scannerTypes array 
      int status; // Extended API return code 
      cCoreScannerClass.Open(0, scannerTypes, numberOfScannerTypes, out status); 
      // Subscribe for barcode events in cCoreScannerClass 
      cCoreScannerClass.BarcodeEvent += new 
      _ICoreScannerEvents_BarcodeEventEventHandler(OnBarcodeEvent); 
      // Let's subscribe for events 
      int opcode = 1001; // Method for Subscribe events 
      string outXML; // XML Output 
      string inXML = "<inArgs>" + 
      "<cmdArgs>" + 
      "<arg-int>1</arg-int>" + // Number of events you want to subscribe 
      "<arg-int>1</arg-int>" + // Comma separated event IDs 
      "</cmdArgs>" + 
      "</inArgs>"; 
      cCoreScannerClass.ExecCommand(opcode, ref inXML, out outXML, out status); 
      Console.WriteLine(outXML); 

     } 
     catch (Exception exp) 
     { 
      Console.WriteLine("Something wrong please check... " + exp.Message); 
     } 
    } 

事件後，該代碼會出現：

void OnBarcodeEvent(short eventType, ref string pscanData) 
{ 
    first = pscanData; 
     printfunction(); 

     } 

此代碼打印功能後寫入文本框：

private void printfunction() 
    { 
     int l = first.IndexOf("<datalabel>"); 
     second = first.Substring(l + 11); 
     int j = second.IndexOf("</datalabel>"); 
     second = second.Substring(0,j-1); 

     string newValue = second.Replace("0x", ""); ; 
     newValue = newValue.Replace(" ", string.Empty); 
     txt = GetStringFromAsciiHex(newValue); 
     TextBox1.Text = txt; 
    } 

請幫幫我。謝謝。

Answer 1

您的本地變量txt是否包含正確的值？如果是這樣，請在設置文本後嘗試TextBox1.Refresh()。