Inotifyproperty改变了全球使用 [英] Inotifypropertychanged global use

问题描述

在WinForms应用程序中，只有在用户更改了内容时才能保存。

为此，我在所有实体类中实现了INotifyPropertyChanged。 br />


现在我想在存储之前知道全局是否在任何领域发生了变化。

什么是最好的方法？

谢谢

LG

妮可

Hi,
In a WinForms application should only be saved if the user has changed something.
To do this, I implement the INotifyPropertyChanged in all entity classes.

Now I want to know globally before storing whether something has changed in any field.
What is the best method?
thank you
LG
Nicole

public string CustomerName
        {
            get
            {
                return this.customerNameValue;
            }

            set
            {
                if (value != this.customerNameValue)
                {
                    this.customerNameValue = value;
                    NotifyPropertyChanged();
                }
            }
        }

我尝试了什么：

What I have tried:

public string CustomerName
        {
            get
            {
                return this.customerNameValue;
            }

            set
            {
                if (value != this.customerNameValue)
                {
                    this.customerNameValue = value;
                    NotifyPropertyChanged();
                }
            }
        }

推荐答案

一种方法是创建一个可重用的基类持有状态的字段或属性。



考虑以下示例

One way could be to create a reusable base class which holds a field or property for the status.

Consider the following example

public class SomeBase {
      public event PropertyChangedEventHandler PropertyChanged;

      private bool _changed;

      public readonly List<string> ChangedProperties;

      public bool Changed {
         get {
            return this._changed;
         }
         set {
            if (this._changed != value) {
               this._changed = value;
               // Reset the list if not changed
               if (!this._changed) {
                  this.ChangedProperties.Clear();
               }
            }
         }
      }

      public SomeBase() {
         this.Changed = false;
         this.ChangedProperties = new List<string>();
      }

      public void NotifyPropertyChanged(string propertyName) {
         PropertyChangedEventHandler eventHandler = PropertyChanged;

         this.Changed = true;
         if (eventHandler != null) {
            eventHandler(this, new PropertyChangedEventArgs(propertyName));
            if (!this.ChangedProperties.Contains(propertyName)) {
               this.ChangedProperties.Add(propertyName);
            }
         }
      }
   }

   public class MyClass : SomeBase {

      private string customerNameValue;

      public string CustomerName {
         get {
            return this.customerNameValue;
         }

         set {
            if (value != this.customerNameValue) {
               this.customerNameValue = value;
               NotifyPropertyChanged("CustomerName");
            }
         }
      }
   }

现在获取数据后，设置将更改状态设置为false，然后您可以检查更改的状态。

Now after fetching the data, set the Changed status to false and after that you can check the status for changes.

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