摘要：
ResourcefromStackOverflow使用存储过程。如何传递数组参数？1.拆分和解析字符串太麻烦了。2.添加SqlServer自定义类型**sp_addtype**问题要求：您需要将数组类型的参数select*从fromUserswhereIDIN（1,2,3）传递给sp。SqlServer数据类型没有数组，但允许用户定义的类型_addtype添加用户定义的数据类型，这允许c#cod
Resource from StackOverflow
使用存储过程，如何传递数组参数？
1.分割解析字符串，太麻烦 2.添加Sql Server 自定义类型 **sp_addtype**问题需求：需要向SP 传递数组类型的参数
select * from Users where ID IN (1,2,3 )
Sql Server 数据类型 并没有数组，但是允许自定义类型，通过 sp_addtype
添加 一个自定义的数据类型，可以允许c# code 向sp传递 一个数组类型的参数
但是不能直接使用 sp_addtype，而是需要结构类型的数据格式，如下：
CREATE TYPE dbo.IDList
AS TABLE
(
ID INT
);
GO
有点像个是一个临时表，一种对象，这里只加了ID
在sp 中可以声明自定义类型的参数
CREATE PROCEDURE [dbo].[DoSomethingWithEmployees]
@IDList AS dbo.IDList readonly
Example
#### 1. First, in your database, create the following two objectsCREATE TYPE dbo.IDList
AS TABLE
(
ID INT
);
GO
CREATE PROCEDURE [dbo].[DoSomethingWithEmployees]
@IDList AS dbo.IDList readonly
AS
SELECT * FROM [dbo].[Employees]
where ContactId in
( select ID from @IDList )
RETURN
2. In your C# code
// Obtain your list of ids to send, this is just an example call to a helper utility function
int[] employeeIds = GetEmployeeIds();
DataTable tvp = new DataTable();
tvp.Columns.Add(new DataColumn("ID", typeof(int)));
// populate DataTable from your List here
foreach(var id in employeeIds)
tvp.Rows.Add(id);
using (conn)
{
SqlCommand cmd = new SqlCommand("dbo.DoSomethingWithEmployees", conn);
cmd.CommandType = CommandType.StoredProcedure;
SqlParameter tvparam = cmd.Parameters.AddWithValue("@List", tvp);
// these next lines are important to map the C# DataTable object to the correct SQL User Defined Type
tvparam.SqlDbType = SqlDbType.Structured;
tvparam.TypeName = "dbo.IDList";
// execute query, consume results, etc. here
}