Question

我想在列移动之前添加数字30。我正在使用此代码：我该怎么做？

using (var command = new SqlCommand("select mobile from memberform where active=1 or active=0", con)) // only retrieve the column, you really need
using (var reader = command.ExecuteReader())
{
    var stringBuilder = new StringBuilder();

    while (reader.Read())
    {
        stringBuilder.Append(reader["mobile"] + ",");
    }

    string result = stringBuilder.ToString().TrimEnd(',',' ');
}

Answer 1

您可以简单地连接该值，如

stringBuilder.Append("30" + reader["mobile"] + ",");

（OR）

更改您的SQL查询本身，如

select '30' + mobile as mobile_number
from memberform 
where active in (1 ,0);

如何在列之前添加数字？

1 个答案: