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  • C# linq to xml 简单示例

    data.xml

     1 <?xml version="1.0" encoding="utf-8" ?>
     2 <Data>
     3   <Products>
     4     <Product Name="West Side Story" Price="9.99" SupplierID="1" />
     5     <Product Name="Assassins" Price="14.99" SupplierID="2" />  
     6     <Product Name="Frogs" Price="13.99" SupplierID="1" />
     7     <Product Name="Sweeney Todd" Price="10.99" SupplierID="3" />
     8   </Products>
     9 
    10   <Suppliers>
    11     <Supplier Name="Solely Sondheim" SupplierID="1" />
    12     <Supplier Name="CD-by-CD-by-Sondheim" SupplierID="2" />
    13     <Supplier Name="Barbershop CDs" SupplierID="3" />
    14   </Suppliers>
    15 </Data>

    通过 linq to xml ,查找价格超过10的产品,并打印供应商名称与产品名称;

     1             XDocument doc = XDocument.Load("data.xml");
     2             var filtered = from p in doc.Descendants("Product")
     3                            join s in doc.Descendants("Supplier")
     4                            on (int)p.Attribute("SupplierID")
     5                            equals (int)s.Attribute("SupplierID")
     6                            where (decimal)p.Attribute("Price") > 10
     7                            select new
     8                            {
     9                                ProductName = (string)p.Attribute("Name"),
    10                                SupplierName = (string)s.Attribute("Name")
    11                            };
    12 
    13             foreach (var v in filtered)
    14             {
    15                 Console.WriteLine("SupplierName={0} , ProductName={1}", v.SupplierName, v.ProductName);
    16             }

    输出

    SupplierName=CD-by-CD-by-Sondheim , ProductName=Assassins
    SupplierName=Solely Sondheim , ProductName=Frogs
    SupplierName=Barbershop CDs , ProductName=Sweeney Todd

     

    参考资料

    1、深入理解C#(第2版);

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  • 原文地址:https://www.cnblogs.com/fanful/p/7954933.html
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