无法从存储过程中获取数据

Question

我试图从 C# 代码访问存储过程，但总是得到结果 == -1。我不知道我哪里出错了。我搜索了很多但没有找到任何解决方案。请查看我的代码片段并指导我做错了什么。

提前致谢。

C#代码：

using (SqlConnection connection = new SqlConnection(getConnectionString()))
using (SqlCommand command = new SqlCommand())
{
    Int32 rowsAffected;

    command.CommandText = "SP_LOGIN_GETUSERBYNAME";
    command.CommandType = CommandType.StoredProcedure;
    // command.Parameters.Add(new SqlParameter("@Email", userObj.email));
    // command.Parameters.Add("@Email", SqlDbType.VarChar).Value = userObj.email.Trim();
    command.Parameters.AddWithValue("@Email", userObj.email.ToString());
    command.Connection = connection;

    connection.Open();
    rowsAffected = command.ExecuteNonQuery();
    connection.Close();

    return rowsAffected;
}

连接字符串：

return "Data Source=MUNEEB-PC;Initial Catalog=HRPayRoll;User ID=sa; Password=sa";

存储过程代码：

CREATE PROCEDURE SP_LOGIN_GETUSERBYNAME
    @Email varchar(50)
AS
    SELECT *
    FROM [User]
    WHERE Email = @Email
GO

Answer 1

来自 ExecuteNonQuery 文档；

For UPDATE, INSERT, and DELETE statements, the return value is the number of rows affected by the command. When a trigger exists on a table being inserted or updated, the return value includes the number of rows affected by both the insert or update operation and the number of rows affected by the trigger or triggers. For all other types of statements, the return value is -1

由于您的命令是 SELECT，得到 -1 作为 return 值也是正常的。

如果您想获得结果，可以改用 ExecuteReader 方法。

var reader = command.ExecuteReader();
while (reader.Read())
{
     // This will iterate your results line by line and
     // You can get columns with zero-based values like reader[0], reader[1] or
     // can use GetXXX methods of it like GetString(0) or GetInt32(1) etc.
}

无法从存储过程中获取数据

Unable to get data from stored procedure

c#

sql-server

stored-procedures

wcf-data-services