我正在从经典ASP切换到ASP.NET.而且我在使用旧方法轻松做一些基本的东西时遇到了一些麻烦.下面是一个方便的ASP函数,我用它来执行几行的标量查询.

FUNCTION ExecuteScalarParams(sqlQuery,Parameter_Array)
Set cmd1 = Server.CreateObject("ADODB.Command") 
cmd1.ActiveConnection = con 
cmd1.CommandText = sqlQuery 
cmd1.CommandType = 1 

FOR ParamCount = 0 TO UBOUND(Parameter_Array)
    cmd1.Parameters(ParamCount) = Parameter_Array(ParamCount)
NEXT 'ParamCount

Set rstScalar = cmd1.Execute()

IF NOT rstScalar.EOF THEN
    arrScalar = rstScalar.GetRows()
    IF UBOUND(arrScalar,2) = 0 THEN
        ExecuteScalarParams = arrScalar(0,0)
    ELSE
        ExecuteScalarParams = NULL
    END IF
ELSE
    ExecuteScalarParams = NULL
END IF

rstScalar.Close
Set rstScalar = Nothing
Set cmd1 = Nothing
END FUNCTION

我曾经传递带有问号的SQL查询作为参数的占位符,如下所示：

SELECT TOP 1 UserName FROM Members WHERE (Created>?) AND (AdminLevel=?);

然后我会设置一个参数数组并将其传递给函数：

MyArray = ARRAY("1-JAN-2012",1)

数组中的参数将按其出现的顺序替换查询字符串中的问号.

我试图在C#中模仿这个函数,但我陷入了必须传递参数的部分.到目前为止,我已经到了必须使用@Created和@AdminLevel等命名占位符而不是问号的点,然后我必须设置这样的参数对象：

sqlParameter param = new sqlParameter();
param.ParameterName = "@AdminLevel";
param.Value = 1;

有没有办法传递参数而不必设置参数名称,只需使用问号和它们出现的顺序来指定哪个参数在哪里？

using (var con = new sqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString))
{
    con.Open();
    {
        using (var command = con.CreateCommand())
        {
            command.Connection = conn;
            command.CommandText = "SELECT * FROM [dbo].[Table] WHERE [c1] = @a AND [c2] = @b";
            command.Parameters.AddWithValue("@a",aVal);
            command.Parameters.AddWithValue("@b",bVal);
            command.CommandType = CommandType.Text;

            using (var reader = command.ExecuteReader())
            {
                if (reader.HasRows)
                {
                    while (reader.Read())
                    {
                        ///
                    }
                }
                else
                {
                    ///
                }
            }
        }
    }
}