托盘0也可以清除消息

source/AssemblyLineClient/FrmLineStore.cs

@@ -1264,9 +1264,9 @@ namespace OnlineStore.AssemblyLine
         private void btnClear_Click(object sender, EventArgs e)
         private void btnClear_Click(object sender, EventArgs e)
         {
         {
             int num = (int)numTrayNum.Value;
             int num = (int)numTrayNum.Value;
-            if (num < 1)
+            if (num < 0)
             {
             {
-                MessageBox.Show("请输入大于1的托盘号", "提示", MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1);
+                MessageBox.Show("请输入大于0的托盘号", "提示", MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1);
                 return;
                 return;
             }
             }
             TrayInfo tray = TrayManager.GetTrayInfo(num);
             TrayInfo tray = TrayManager.GetTrayInfo(num);