Question

我正在尝试从SQL Server的某个表中获取项目列表。我是用Visual Studio 2010做的。

这是我的代码：

static string filter = "25";

DataSet Datos = new DataSet();
SqlConnection MyConnection = default(SqlConnection);
SqlDataAdapter MyDataAdapter = default(SqlDataAdapter);
MyConnection = new SqlConnection("Initial Catalog=MyDataBase;Data Source=MyServer;Integrated Security=false;User ID=SQLUser;Password=SQLPass;");
MyDataAdapter = new SqlDataAdapter("SELECT Comment FROM MyTable WHERE [No_] = "+filter+" , MyConnection);
MyDataAdapter.SelectCommand.CommandType = CommandType.Text;
MyDataAdapter.Fill(Datos);
MyDataAdapter.Dispose();
MyConnection.Close();

我收到了这个错误：

参数1：无法从'string'转换为'System.Data.SqlClient.SqlCommand'

在这一行：

MyDataAdapter = new SqlDataAdapter("SELECT Comment FROM MyTable WHERE [No_] = "+filter+" , MyConnection);

那么，我怎样才能将字符串放入SqlConnection？

提前致谢。

Answer 1

这对我有用：

string filter = "10";

DataSet Datos = new DataSet();
string connectionString = "<your connection string here>";
string selectCommand = 
  "SELECT * FROM myTable WHERE Id = " + filter;
using (var MyConnection = new SqlConnection(connectionString))
using (var MyDataAdapter = new SqlDataAdapter(selectCommand, MyConnection))
{
   MyDataAdapter.SelectCommand.CommandType = CommandType.Text;
   MyDataAdapter.Fill(Datos);
}

这基本上是您的代码，使用using语法。如果您仍然遇到问题，请尝试并发布。祝你好运！

Web服务从字符串转换为System.Data.SqlClient.SqlCommand

1 个答案: