查询页面单号输入空数据问题修复

QueryPage.xaml.cs

@@ -35,12 +35,16 @@ public partial class QueryPage : ContentPage
 
         CardCollectionView.ItemsSource = DyelotItems;
     }
+
+    //扫码按钮
     private async void OnScanButtonClicked(object sender, EventArgs e)
     {
+        ResultEntry.Text = "";
         // 跳转到扫码页面
         await Navigation.PushAsync(new ScanPage(0));
     }
 
+    //打开单个选项卡
     private async void TapGestureRecognizer_Tapped(object sender, TappedEventArgs e)
     {
         if (sender is Microsoft.Maui.Controls.BindableObject bindable)
@@ -52,6 +56,7 @@ public partial class QueryPage : ContentPage
                 await Navigation.PushAsync(new QueryDetail(item));
             }
         }
+        ResultEntry.Text = "";
     }
 
     //信息回复
@@ -105,7 +110,7 @@ public partial class QueryPage : ContentPage
 
     private void Button_Clicked(object sender, EventArgs e)
     {
-        if (ResultEntry.Text != null)
+        if (ResultEntry.Text.Length >0)
         {
             Dictionary<string, object> QueryDictionary = new Dictionary<string, object>();
             QueryDictionary.Add("Command", "QueryDyelot");
@@ -113,7 +118,7 @@ public partial class QueryPage : ContentPage
                 "[Batch],[OrderNo],[TotalWeight],[LiquidRatio],[TotalVolume],[Final],[UserAccount]," +
                 "[FabricName],[ColorName],[CustomerName],[Notes]");
             QueryDictionary.Add("DyelotName", ResultEntry.Text);
-            Query_Command(QueryDictionary.ToJsonString());
+            Query_Command(QueryDictionary.ToJsonString());            
         }
         else
         {