使用visual studio 2012在WPF中使用DataGrid示例 [英] DataGrid sample in WPF using visual studio 2012

问题描述

我有以下Xaml代码

I have following Xaml code

<code><Window x:Class="simpledatagrid.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="IDDATA" Height="350" Width="525">
<Grid  >
    <DataGrid  Name="dgsample" BorderBrush="Black" BorderThickness="2" AutoGenerateColumns="True" CanUserAddRows="True" CanUserDeleteRows="True"  Margin="200,10,10,75"></DataGrid>

    <Label  Content="ID :" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Height="26" Width="27"/>
    <Label  Content="Name :" HorizontalAlignment="Left" Margin="10,60,0,0" VerticalAlignment="Top" Height="26" Width="48"/>
    <Label  Content="Salary :" HorizontalAlignment="Left" Margin="10,110,0,0" VerticalAlignment="Top" Height="26" Width="47"/>

    <TextBox Name="tb1" HorizontalAlignment="Left" Height="20" Margin="60,10,0,0" TextWrapping="NoWrap" Text="" VerticalAlignment="Top" Width="100" />
    <TextBox Name="tb2" HorizontalAlignment="Left" Height="20" Margin="60,60,0,0" TextWrapping="NoWrap" Text="" VerticalAlignment="Top" Width="100"/>
    <TextBox Name="tb3" HorizontalAlignment="Left" Height="20" Margin="60,110,0,0" TextWrapping="NoWrap" Text="" VerticalAlignment="Top" Width="100"/>

    <Button Content="Get" HorizontalAlignment="Left" Margin="10,190,0,0" VerticalAlignment="Top" Width="75" Click="Get_Click" />
    <Button Content="Add" HorizontalAlignment="Left" Margin="10,230,0,0" VerticalAlignment="Top" Width="75" Click="Add_Click" />
    <Button Content="Delete" HorizontalAlignment="Left" Margin="10,270,0,0" VerticalAlignment="Top" Width="75" Click="Delete_Click" />
</Grid></code>

这是.cs代码

This is .cs code

public partial class MainWindow : Window
{
    ObservableCollection<User> Users = new ObservableCollection<User>();
    public MainWindow()
    {
        InitializeComponent();

                    Users.Add(new User() { Id = 101, Name = "Allen", Salary = 10 });
                    Users.Add(new User() { Id = 102, Name = "king", Salary = 20 });
                    Users.Add(new User() { Id = 103, Name = "scot", Salary = 30 });
                    Users.Add(new User() { Id = 104, Name = "havy", Salary = 40 });
                    Users.Add(new User() { Id = 105, Name = "xen", Salary = 50 });
                    Users.Add(new User() { Id = 106, Name = "len", Salary = 60 });

                    dgsample.ItemsSource = Users;

            }

    private void Get_Click(object sender, RoutedEventArgs e)
    {


        {

            User currentUser = Users.Single(select => select.Id == int.Parse(this.tb1.Text));
            this.tb2.Text = currentUser.Name;
            this.tb3.Text = currentUser.Salary.ToString();

        }


        }



    private void Add_Click(object sender, RoutedEventArgs e)
    {
        Users.Add(new User() { Id = int.Parse(tb1.Text), Name = tb2.Text, Salary = int.Parse(tb3.Text) });
    }

    private void Delete_Click(object sender, RoutedEventArgs e)
    {

        Users.RemoveAt(dgsample.SelectedIndex);


    }

    }

此代码正常运行，现在我需要的是如果我输错了它应该在MessageBox中显示不在DatGrid中的ID无效，如果我在TextBox中输入ID并单击删除按钮，它应该被删除..请帮助我使用我刚接触WPF的代码

This code is working,now i need is if i enter wrong ID which is not in the DatGrid it should show in the MessageBox as invalid and also if i enter the ID in the TextBox and click on the delete button it should get delete..please help me with the code I'm new to WPF

推荐答案

你的问题与WPF无关。



你在Get_Click方法上需要检查是否用户输入了有效的ID。这样的事情：

Your question has nothing to do with WPF.

On you Get_Click method you need to check if the user has entered a valid ID. somthing like this:

private void Get_Click(object sender, RoutedEventArgs e)
{
    int index;
    if (int.TryParse(this.tb1.Text, out index))
    {
        User currentUser = Users.FirstOrDefault(u => u.Id == index);
        if (currentUser != null)
        {
            this.tb2.Text = currentUser.Name;
            this.tb3.Text = currentUser.Salary.ToString();
        }
        else
            MessageBox.Show("User with the provided ID does not Exist", "Error");
    }
    else
        MessageBox.Show("ID entered is not valid number", "Error");
}

您对删除方法进行类似检查，方法是检查用户是否输入了有效的ID，如果是，则删除该项目。

you do a similar check on the delete method, by checking if the user has entered a valid id and if yes then delete the item.

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