代码中的OneTime绑定与直接设置本地值不同吗?

这个OneTime绑定和

有什么区别?

//Create the source string
string s = "Hello";
//Create the binding description
Binding b = new Binding("");
b.Mode = BindingMode.OneTime;
b.Source = s;
//Attach the binding to the target
MyText.SetBinding(TextBlock.TextProperty, b);

这吗?

MyText.Text = s;