c# - 不存在从对象类型 System.Int32[] 到已知托管提供程序本机类型的映射

Question

我在以下代码中遇到了上述错误。这listid是一个列表integers。

SqlConnection cn = new SqlConnection(str1);
SqlCommand cmd = new SqlCommand("select * from status where uid in {@values}", cn);
cn.Open();
cmd.Parameters.AddWithValue("@values",listid.ToArray())
SqlDataReader dr = cmd.ExecuteReader();
while (dr.Read())
{
//code here
}

Answer 1

您可以将查询更改为：

SqlCommand cmd = new SqlCommand (String.Format ("SELECT * FROM status WHERE uid IN ({0})", String.Join (",", listid)));

并删除 AddWithValue() 行。