关于SilverLight中的TwoWay绑定. [英] About TwoWay Binding in SilverLight.

问题描述

Hai朋友，

谁能解释一下如何使用TwoWay Binding.例如，

我有2个具有属性Twoway Binding的文本框，我需要将数据从这2个文本框插入到数据库(或)到XmlFile.我知道我们必须使用名为DataContext和Notifychanded属性的类……，但是我不知道如何使用它们.用一些示例代码进行解释将很有帮助.

谢谢.....

Hai friends,

Can anybody explain me how to work with TwoWay Binding. For Example,

I have 2 textboxs with property Twoway Binding, i need to insert the data from those 2 textboxes to my Database (or) to XmlFile. I came to know that we have to use the class called DataContext and Notifychanded property sth..., but i dont know how to use those. It will be helpful to explain with some sample code.

Thanks.....

推荐答案

您需要按照以下步骤操作，

您的绑定类应使用INotifyPropertyChanged接口实现，在该接口中您需要实现相关的属性，如下例所示.

You need to folow below steps,

Your binding class should be implemeted with INotifyPropertyChanged Interface where you need to implement relavant properties, as below example.

public class MyProduct : INotifyPropertyChanged
    {
        private Dictionary<string, object> _properties = new Dictionary<string, object>();

        protected virtual T GetValue<T>(string name)
        {
            if (this._properties.ContainsKey(name))
                return (T)this._properties[name];

            return default(T);
        }

        protected virtual void SetValue<T>(string name, T value)
        {
            bool set = false;
            if (!this._properties.ContainsKey(name))
            {
                this._properties.Add(name, value);
                set = true;
            }
            else if (!object.Equals(this._properties[name], value))
            {
                this._properties[name] = value;
                set = true;
            }
            if (set)
            {
                this.NotifyChange(name);
            }
        }

        protected virtual void NotifyChange(params string[] properties)
        {
            if (PropertyChanged != null)
            {
                foreach (string p in properties)
                    PropertyChanged(this, new PropertyChangedEventArgs(p));
            }
        }
        #region INotifyPropertyChanged Members
        public event PropertyChangedEventHandler PropertyChanged;
        #endregion
    }

然后，此类需要使用两种方式的绑定方式与relavnt网格和属性与相对文本框进行绑定.

Then this class need to bind with relavnt gird and property with relavant textbox with two way binding mode.

Mode="TwoWay"

谢谢，
Amit Patel

Thanks,
Amit Patel

Hai Amit M Patel，您的代码很好，但是您可以解释一下如何将文本框中的数据发送到Product Class属性到(SetValue和GetValue)，以及如何将数据可以存储到数据库.最好对此有一个清晰的了解，我将用您的示例尝试一下.

Hai Amit M Patel, ur code is fine, but can u pls explain how to send the data from textbox to the Product Class properties to(SetValue & GetValue) and how the data can be stored to database. Better to have some clear understanding about this and i will try my own with ur example.

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