如何在WPF中找到ListBox中元素的总和

Question

如何查找ListBox中元素的总和。我只需要找到一种方法来存储列表框和输出的值的总和，一旦用户插入错误的输入

private void theMethod(object sender, RoutedEventArgs e) 
    { 


     // YesButton Clicked! Let's hide our InputBox and handle the input text. 
     InputBox.Visibility = System.Windows.Visibility.Collapsed; 

     // Do something with the Input 
     String input = InputTextBox.Text; 
     int result = 0; 
     if (int.TryParse(input, out result)) 
     { 
      MyListBox.Items.Add(result); // Add Input to our ListBox. 
     } 
     else { 
      String[]arr = new String[3]; 
      // I just want to be able to output the sum of the elements of the ListBox (MyListBox) 
      for (i = 0; i < MyListBox.Items.Count; i++) 
      { 
       //MyListBox.Items[i].ToString(); 

       MyListBox.Items.Cast<ListBoxItem>().Sum(x => Convert.ToInt32(x)).ToString(); 

      } 
      sum.ToString(); 
      MessageBox.Show("Sum is: " +MyListBox.Items.Cast<ListBoxItem>().Sum(x => Convert.ToInt32(x)).ToString()); 

     } 

Answer 1

这个工作对我来说，试试这个：

private void YesButton_Click(object sender, RoutedEventArgs e) 
    { 
     int sum = 0; 
     int i = 0; 
     // YesButton Clicked! Let's hide our InputBox and handle the input text. 
     InputBox.Visibility = System.Windows.Visibility.Collapsed; 

    // Do something with the Input 
    String input = InputTextBox.Text; 
    int result = 0; 
    if (int.TryParse(input, out result)) 
    { 
     MyListBox.Items.Add(result); // Add Input to our ListBox. 
    } 
    else 
    { 
     sum = MyListBox.Items.Cast<int>().Sum(x => Convert.ToInt32(x)); 
     MessageBox.Show("Sum is: " +sum); 
    } 
    // Clear InputBox. 
    InputTextBox.Text = String.Empty; 
}