如何使用 C# 从 SQL 查询中检索参数

Question

I need help in retrieving parameters in SQL query (not stored procedure) and their data types in C#. Here is a sample query.

Declare @param1 int
Declare @param2 varchar(255)

Select * 
from tablenanme 
where col1 = @param1 and col2 = @param2

How can I also assign these values dynamically in C#

I've tried but I can really figure it out

Answer 1

Don't declare local variables in the batch. Instead, add parameters/values to the command object:

var command = new SqlCommand("Select * from tablenanme where col1=@param1 and col2=@param2", connection);
command.Parameters.Add("@param1", SqlDbType.Int).Value = col1Value;
command.Parameters.Add("@param2", SqlDbType.VarChar, 255).Value = co2Value;