System.Data.SqlClient.SqlParameterCollection does not contain a definition for 'AddWithvalue'

Question

    public static DataTable SqlDataTable(string sql, IDictionary<string, object> values)
    {
        using (SqlConnection conn = new SqlConnection(GetConnectionString))
        using (SqlCommand cmd = new SqlCommand(sql, conn))
        {
            conn.Open();

            foreach (var item in values)
            {
                cmd.Parameters.AddWithvalue("@" + item.Key, item.Value);  // error
            }
          .......
          ........

Error 4 'System.Data.SqlClient.SqlParameterCollection' does not contain a definition for 'AddWithvalue' and no extension method 'AddWithvalue' accepting a first argument of type 'System.Data.SqlClient.SqlParameterCollection' could be found (are you missing a using directive or an assembly reference?)

Why I get this error ?

Answer 1

C#是case-sensitive语言。您尝试调用的方法是AddWithValue ，大写V而不是AddWithvalue 。