为什么我在这里得到“指定的演员无效”？

Question

I have a column MyColumn of type INT and I am retrieving some rows with that column

string selectQuery = $@" SELECT [MyColumn] FROM [dbo].[MyTable]
                         WHERE [Id] IN ('{testid_1}','{testid_2}','{testid_3}')
                         ORDER BY [MyColumn]";

var vals = mydb.ExecuteQuery<int?>(selectQuery).ToList();

where db is of type DataContext .

Any idea why this is giving me an invalid cast exception?

Answer 1

这是因为下面的行试图将VARCHAR类型转换为INT

WHERE [Id] IN ('{testid_1}','{testid_2}','{testid_3}')