使用 IEqualityComparer来过滤PagedCollectionView里的重复数据

很多情况下我们获取的PagedCollectionView数据集内有很多重复的数据，我们可以使用 IEqualityComparer<T> 来过滤。

数据模型：

public class Product { public string Name { get; set; } public int Code { get; set; } }

建一个过滤重复内容的类：

// Custom comparer for the Product class class ProductComparer : IEqualityComparer<Product> { // Products are equal if their names and product numbers are equal. public bool Equals(Product x,Product y) { //Check whether the compared objects reference the same data. if (Object.ReferenceEquals(x,y)) return true; //Check whether any of the compared objects is null. if (Object.ReferenceEquals(x,null) || Object.ReferenceEquals(y,null)) return false; //Check whether the products' properties are equal. return x.Code == y.Code && x.Name == y.Name; } // If Equals() returns true for a pair of objects // then GetHashCode() must return the same value for these objects. public int GetHashCode(Product product) { //Check whether the object is null if (Object.ReferenceEquals(product,null)) return 0; //Get hash code for the Name field if it is not null. int hashProductName = product.Name == null ? 0 : product.Name.GetHashCode(); //Get hash code for the Code field. int hashProductCode = product.Code.GetHashCode(); //Cal<a href="/tag/cula/" target="_blank" class="keywords">cula</a>te the hash code for the product. return hashProductName ^ hashProductCode; } }

在Silverlight中调用：

if (e.Result != null) { try { PagedCollectionView pcv = new PagedCollectionView(e.Result); List<Product> pp = new List<Product>(); foreach (Product p in pcv) { pp.Add(p); } this.list<a href="/tag/Box/" target="_blank" class="keywords">Box</a>1.ItemsSource = pp.<a href="/tag/dis/" target="_blank" class="keywords">dis</a>tinct(new ProductComparer()); } catch { Message<a href="/tag/Box/" target="_blank" class="keywords">Box</a>.Show("<a href="/tag/huoqu/" target="_blank" class="keywords">获取</a>XX<a href="/tag/neirong/" target="_blank" class="keywords">内容</a>失败！"); } }