LINQ巩固

1. LINQ过滤运算符
   Where 基于谓词函数过滤值
   测试例子如下:

public class TestModel
{
    public string Name { get; set; }
    public string Age { get; set; }
}

 List<TestModel> lst = new List<TestModel>()
            {
                new TestModel(){Name = "张三" },
                new TestModel(){Name = "李四" },
            };
var querys1 = from item in lst where item.Name == "李四" select item;
var querys2 = lst.Where(item => item.Name == "李四");

2. LINQ Join操作

··· C#
List lst = new List()

        {
            new TestModel(){Name = "张三", Age = "23" },
            new TestModel(){Name = "李四", Age = "43" },
        };
        List<CameraModel> lstCamera = new List<CameraModel>()
        {
            new CameraModel(){Name = "张三", Price = "sfsf" },
            new CameraModel(){Name = "张三", Price = "测试工程时" },
            new CameraModel(){Name = "李四", Price = "买菜的" }
        };

var query = from it in lst
join item in lstCamera on it.Name equals item.Name
select new
{
it.Name,
it.Age,
item.Price
};

···

3. LINQ投影操作

var querys = from ite in lst from item in lstCamera select ite;

4. LINQ排序运算符

5. LINQ分组操作

5. LINQ转换操作

6. LINE级联

7. LINQ聚合

8. LINQ量词操作

9. LINQ分区操作符

10. LINQ元素操作符