WPF DataGrid 验证错误

使用WPF DataGrid进行数据验证是在WPF应用程序中非常常见的任务之一。DataGrid是一个强大的控件，可以用于显示和编辑表格数据。然而，当用户输入无效数据时，我们希望能够及时地捕捉到这些错误，并向用户提供相应的反馈。本文将介绍如何在WPF DataGrid中实现数据验证，并提供一个案例代码来演示其用法。

csharp
public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
}
public class MainViewModel
{
    public ObservableCollection People { get; set; }
    public MainViewModel()
    {
        People = new ObservableCollection()
        {
            new Person { Name = "Alice", Age = 25 },
            new Person { Name = "Bob", Age = 30 },
            new Person { Name = "Charlie", Age = 35 }
        };
    }
}

xaml
    
        
        
    

csharp
public class Person : IDataErrorInfo
{
    public string Name { get; set; }
    public int Age { get; set; }
    public string this[string columnName]
    {
        get
        {
            string error = null;
            switch (columnName)
            {
                case "Name":
                    if (string.IsNullOrEmpty(Name))
                        error = "Name is required.";
                    break;
                case "Age":
                    if (Age < 0 || Age > 120)
                        error = "Age must be between 0 and 120.";
                    break;
            }
            return error;
        }
    }
    public string Error => null;
}