Question

如何按行ID更新DataGrid中的单个单元格？

我的输出目前适用于一个静态行。（MessageBox输出显示正确的值）我的目的是在整个网格中使用它。

private void btnUpdateUserData_Click(object sender, RoutedEventArgs e)
{
   MessageBox.Show("ID: " + mUserDataObject[0].ID + ", Username: " + 
                    mUserDataObject[0].Username + ", Password: " + 
                    mUserDataObject[0].Password + ", Rolle: " + 
                    mUserDataObject[0].Role);
        // to be implemented
        // mUserDataObject[i].Username = "New Username";
}

XAML代码

<DataGridTemplateColumn>
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <Button Click="btnUpdateUserData_Click">Update</Button>
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>

Answer 1

如果您想要更新单击按钮的行的值，请获取代表 DataContext 对象的 instance of User 按钮。< / p>

直接为实例修改属性，只要 INotifyPropertyChanged 在用户类上实现，它就会立即反映在用户界面中。

private void btnUpdateUserData_Click(object sender, RoutedEventArgs e)
{
   dataGrid.CommitEdit(); // Add this line so that any editing cell gets commit.
   User currentUser = ((Button)sender).DataContext as User;    
   MessageBox.Show("ID: " + currentUser.ID + ", Username: " + 
                    currentUser.Username + ", Password: " + 
                    currentUser.Password + ", Role: " + 
                    currentUser.Role);   

   currentUser.Username = "New Username";
}

<强>更新

如果要更新SelectedItem的属性，请将x:Name提供给您的dataGrid并使用它来访问dataGrid的所选项目。

<强> XAML

<DataGrid x:Name="dataGrid">
   ....
</DataGrid>

<强> Code behind

private void btnUpdateUserData_Click(object sender, RoutedEventArgs e)
{
   dataGrid.CommitEdit(); // Add this line so that any editing cell gets commit.
   User currentUser = dataGrid.SelectedItem as User;
   // currentUser will be null in case SelectedItem is null.
   if(currentUser != null)
   {
      MessageBox.Show("ID: " + currentUser.ID + ", Username: " + 
                       currentUser.Username + ", Password: " + 
                       currentUser.Password + ", Rolle: " + 
                       currentUser.Role);

      currentUser.Username = "New Username";
   }
}

更新DataGrid中的单个单元格

1 个答案: