扫码调整。

WinFormControl/UScanPanel.cs

@@ -45,6 +45,7 @@ namespace WinFormControl
     }
 
     bool reading = false;
+    string _scarText = string.Empty;
     private void ParentForm_KeyPress(object sender, KeyPressEventArgs e)
     {
       if (!reading)
@@ -55,24 +56,25 @@ namespace WinFormControl
       }
 
       if (!textBox1.Focused)
-      {
         textBox1.Focus();
-        textBox1.Text = e.KeyChar.ToString();
-        textBox1.Select(textBox1.TextLength, 0);
-      }
 
       if (e.KeyChar == (char)Keys.Enter)
       {
         e.Handled = true;
-        var code = ParseCode(textBox1.Text);
+        var code = ParseCode(_scarText);
         textBox1.Text = code;
         textBox1.Select(textBox1.TextLength, 0);
+        _scarText = string.Empty;
         reading = false;
         if (AfterScan != null)
           AfterScan();
       }
       else
+      {
         reading = true;
+        e.Handled = true;
+        _scarText += e.KeyChar.ToString();
+      }
     }
 
     static string ParseCode(string url)