Question

如何在for循环中访问字段值的列名。

我不想对列名进行硬编码。

DataAccessObject NewDao = Settings.IntranetDBDataAccessObject;
string UserName = "";
string WorkPhone = "";
string ColumnName = "";

if (Request.QueryString["user_id"] != null && Request.QueryString["user_id"].Length != 0) {
     SqlCommand Select = new SqlCommand("SELECT emp_name, phone_work FROM employees WHERE emp_id="+ 
     NewDao.ToSql(Request.QueryString["user_id"].ToString(),FieldType.Integer),NewDao);

    DataRowCollection newDr = Select.Execute().Tables[0].Rows;

    for(int i = 0; i < newDr.Count; i++) {
       UserName = newDr[i]["emp_name"].ToString();
       WorkPhone = newDr[i]["phone_work"].ToString();

       //Is there a way to access the Key column that contains data row field value?
      //ColumnName = newDr[i][ ?columnNameFromSelect? ].ToString();
    }

    // Show a label value 
    UserInfo.Text =  UserName + ", phone: "+WorkPhone;
}

Answer 1

您应该使用DataTable的{{1}}属性：

Columns

Answer 2

您也可以从datareader获取查询中的架构：

SqlDataReader reader = command.ExecuteReader();
DataTable schemaTable = reader.GetSchemaTable();

根据msdn的文档： https://msdn.microsoft.com/en-us/library/haa3afyz%28v=vs.110%29.aspx 关于从DataReader获取架构信息的部分

如何从c＃中的select语句中获取列名？

2 个答案: