與添加查詢參數的問題

Question

代碼：

com.CommandText = "select username, pass from Employees where lastName like '@Last' and firstName like '@First'"; 
com.Parameters.AddWithValue("@Last", lastName); // lastName is a method argument 

SqlParameter param = new SqlParameter(); 
param.ParameterName = "@First"; 
param.Value = firstName; 
com.Parameters.Add(param); 

不管我做什麼，參數沒有插入。是什麼賦予了？

Answer 1

不要把單引號放在你的參數中，這些都是隱含的。

而且，嘗試使用SqlCommand.CreateParameter還有：

com.CommandText = "select username, pass from Employees where lastName like @Last and firstName like @First"; 
com.Parameters.AddWithValue("@Last", lastName); // lastName is a method argument 

SqlParameter param = com.CreateParameter(); 
param.ParameterName = "@First"; 
param.Value = firstName; 
com.Parameters.Add(param); 

Answer 2

試圖改變 '@Last' 到@Last，對於第一次同樣的事情...