c# - 我可以以某种方式暂时禁用WPF数据绑定(bind)更改吗？

我有一个使用MVVM数据绑定(bind)的WPF应用程序。我将项目添加到ObservableCollection<...>中，并且确实有很多。

现在，我想知道每次将一个添加到集合中时，它是否立即触发事件并导致不必要的开销？如果是这样，我是否可以以某种方式暂时禁用事件通知，并在代码末尾手动将其触发一次，这样，如果我添加1万个项目，它只会被触发一次，而不是一万次？

更新:我尝试过这个课:

using System;
using System.Linq;
using System.Collections.Specialized;
using System.Collections.Generic;

namespace MyProject
{

    /// <summary>
    /// Represents a dynamic data collection that provides notifications when items get added, removed, or when the whole list is refreshed.
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public class ObservableCollection<T> : System.Collections.ObjectModel.ObservableCollection<T>
    {

        /// <summary>
        /// Adds the elements of the specified collection to the end of the ObservableCollection(Of T).
        /// </summary>
        public void AddRange(IEnumerable<T> collection)
        {
            foreach (var i in collection) Items.Add(i);
            OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, collection.ToList()));
        }

        /// <summary>
        /// Removes the first occurence of each item in the specified collection from ObservableCollection(Of T).
        /// </summary>
        public void RemoveRange(IEnumerable<T> collection)
        {
            foreach (var i in collection) Items.Remove(i);
            OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Remove, collection.ToList()));
        }

        /// <summary>
        /// Clears the current collection and replaces it with the specified item.
        /// </summary>
        public void Replace(T item)
        {
            ReplaceRange(new T[] { item });
        }
        /// <summary>
        /// Clears the current collection and replaces it with the specified collection.
        /// </summary>
        public void ReplaceRange(IEnumerable<T> collection)
        {
            List<T> old = new List<T>(Items);
            Items.Clear();
            foreach (var i in collection) Items.Add(i);
            OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Replace, collection.ToList()));
        }

        /// <summary>
        /// Initializes a new instance of the System.Collections.ObjectModel.ObservableCollection(Of T) class.
        /// </summary>
        public ObservableCollection() : base() { }

        /// <summary>
        /// Initializes a new instance of the System.Collections.ObjectModel.ObservableCollection(Of T) class that contains elements copied from the specified collection.
        /// </summary>
        /// <param name="collection">collection: The collection from which the elements are copied.</param>
        /// <exception cref="System.ArgumentNullException">The collection parameter cannot be null.</exception>
        public ObservableCollection(IEnumerable<T> collection) : base(collection) { }
    }
}

我现在收到此错误:



错误出现在这里:

OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Add, collection.ToList()));

最佳答案

一种快速简便的方法是，在调用AddRange时，将ObservableCollection子类化并暂停通知。请参阅following blog post进行澄清。