ObjectDataProvider 作为Binding的Source来使用的案例

最新推荐文章于 2025-04-11 16:51:06 发布

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本文通过一个具体的实例展示了如何使用ObjectDataProvider作为Binding的Source来实现数据绑定，包括前端界面设计与后台代码实现。

ObjectDataProvider 作为Binding的Source来使用的案例：

前端：

<Window x:Class="Demo.ObjDataProviderDemo"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="ObjDataProviderDemo" Height="300" Width="300">
    <Grid>
        <StackPanel Background="LightBlue">
            <TextBox x:Name="textBoxArg1" Margin="5"/>
            <TextBox x:Name="textBoxArg2" Margin="5"/>
            <TextBox x:Name="textBoxResult" Margin="5"/>
        </StackPanel>
    </Grid>
</Window>

后台：

namespace Demo
{
    public partial class ObjDataProviderDemo : Window
    {
        public ObjDataProviderDemo()
        {
            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 bindingToArg1 = new Binding("MethodParameters[0]")
            {
                Source = odp,
                BindsDirectlyToSource = true,
                UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged
            };

            Binding bindingToArg2 = new Binding("MethodParameters[1]")
            {
                Source = odp,
                BindsDirectlyToSource = true,
                UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged
            };

            Binding bindingToResult = new Binding(".") 
            {
                Source=odp
            };

            this.textBoxArg1.SetBinding(TextBox.TextProperty, bindingToArg1);
            this.textBoxArg2.SetBinding(TextBox.TextProperty, bindingToArg2);
            this.textBoxResult.SetBinding(TextBox.TextProperty, bindingToResult);
        }
    }

    class Calculator
    {
        public string Add(string arg1, string arg2)
        {
            double x = 0;
            double y = 0;
            double z = 0;
            if (double.TryParse(arg1, out x) && double.TryParse(arg2, out y))
            {
                z = x + y;
                return z.ToString();
            }
            return "Input Error!";
        }
    }
}