LINQ系列：LINQ to SQL Take/Skip

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本文介绍了如何使用LINQ进行数据库的分页查询操作，包括Take和Skip方法的应用，并提供了具体的C#代码示例和对应的SQL语句转换，帮助读者理解如何在实际项目中实现高效的数据分页。

1. Take

var expr = context.Products
    .Take(10);

var expr = (from p in context.Products
            select p)
            .Take(10);

SELECT TOP (10) 
    [c].[ProductID] AS [ProductID], 
    [c].[CategoryID] AS [CategoryID], 
    [c].[ProductName] AS [ProductName], 
    [c].[UnitPrice] AS [UnitPrice], 
    [c].[UnitsInStock] AS [UnitsInStock], 
    [c].[Discontinued] AS [Discontinued]
    FROM [dbo].[Product] AS [c]

2. Skip

　　在使用Skip方法之前，需要先有OrderBy排序。

var expr = context.Products
    .Select(p => new { p.ProductID, p.ProductName })
    .OrderBy(p => p.ProductID)
    .Skip(10);

SELECT 
    [Extent1].[ProductID] AS [ProductID], 
    [Extent1].[ProductName] AS [ProductName]
    FROM ( SELECT [Extent1].[ProductID] AS [ProductID], [Extent1].[ProductName] AS [ProductName], row_number() OVER (ORDER BY [Extent1].[ProductID] ASC) AS [row_number]
        FROM [dbo].[Product] AS [Extent1]
    )  AS [Extent1]
    WHERE [Extent1].[row_number] > 10
    ORDER BY [Extent1].[ProductID] ASC

3. 分页查询Take/Skip

var expr = context.Products
    .Select(p => new { p.ProductID, p.ProductName })
    .OrderBy(p => p.ProductID)
    .Skip(10)
    .Take(10);

SELECT TOP (10) 
    [Extent1].[ProductID] AS [ProductID], 
    [Extent1].[ProductName] AS [ProductName]
    FROM ( SELECT [Extent1].[ProductID] AS [ProductID], [Extent1].[ProductName] AS [ProductName], row_number() OVER (ORDER BY [Extent1].[ProductID] ASC) AS [row_number]
        FROM [dbo].[Product] AS [Extent1]
    )  AS [Extent1]
    WHERE [Extent1].[row_number] > 10
    ORDER BY [Extent1].[ProductID] ASC