wpf ObjectDataProvider数据源使用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;

namespace WpfApp02
{
    /// <summary>
    /// TestWin02.xaml 的交互逻辑
    /// </summary>
    public partial class TestWin02 : Window
    {
        public TestWin02()
        {
            InitializeComponent();
            this.SetBinding();
        }

        private void SetBinding()
        {
            ObjectDataProvider odp = new ObjectDataProvider();
            odp.ObjectInstance = new Calculator();
            odp.MethodName = "Add";
            odp.MethodParameters.Add("0");
            odp.MethodParameters.Add("0");

            Binding arg1Binding = new Binding("MethodParameters[0]") { Source = odp, BindsDirectlyToSource = true, UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged };
            txtArg1.SetBinding(TextBox.TextProperty, arg1Binding);

            Binding arg2Binding = new Binding("MethodParameters[1]") { Source = odp, BindsDirectlyToSource = true, UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged };
            txtArg2.SetBinding(TextBox.TextProperty, arg2Binding);

            txtResult.SetBinding(TextBox.TextProperty, new Binding(".") { Source = odp });

        }
       
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WpfApp02
{
    public class Calculator
    {
        public string Add(string arg1, string arg2)
        {
            double x, y, z;
            if (double.TryParse(arg1, out x) && (double.TryParse(arg2, out y)))
            {
                z = x + y;
                return z.ToString();
            }
            else
                return "Input Error";
        }
    }
}

<Window x:Class="WpfApp02.TestWin02"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp02"
        mc:Ignorable="d"
        Title="TestWin02" Height="450" Width="800">
    <Grid>
        <StackPanel>
            <TextBox x:Name="txtArg1"/>
            <TextBox x:Name="txtArg2"/>
            <TextBox x:Name="txtResult"/>
         
        </StackPanel>
    </Grid>
</Window>