ADO.NET獲取數據（DataSet）同時獲取表的架構

普通的ADO.NET獲取DataSet的寫法如下：

using System.Configuration; using System.Data; using System.Data.SqlClient; public class SQLHelper { private static readonly string ConnectionString = ConfigurationManager.ConnectionStrings["Default"].ConnectionString; public static DataSet GetDataSet(string sql) { using (SqlConnection conn =new SqlConnection(ConnectionString)) { SqlCommand cmd = new SqlCommand(sql, conn); SqlDataAdapter adapter = new SqlDataAdapter(cmd); DataSet ds = new DataSet(); conn.Open(); adapter.Fill(ds); return ds; } } }

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <connectionStrings>
    <add name="Default" connectionString="Data Source=.;Initial Catalog=EFDb;Integrated Security=true"/>
  </connectionStrings>
</configuration>

這里需要獲取DataTable的主鍵信息，調試時發現沒有主鍵信息，而實際數據庫中是有主鍵（Id）

此時需要給SqlDataAdapter設置屬性MissingSchemaAction為System.Data.MissingSchemaAction.AddWithKey

修改后的SQLHelper為

using System.Configuration; using System.Data; using System.Data.SqlClient; public class SQLHelper { private static readonly string ConnectionString = ConfigurationManager.ConnectionStrings["Default"].ConnectionString; public static DataSet GetDataSet(string sql) { using (SqlConnection conn =new SqlConnection(ConnectionString)) { SqlCommand cmd = new SqlCommand(sql, conn); SqlDataAdapter adapter = new SqlDataAdapter(cmd); adapter.MissingSchemaAction = MissingSchemaAction.AddWithKey; DataSet ds = new DataSet(); conn.Open(); adapter.Fill(ds); return ds; } } }