ExecuteReader 需要一个打开且可用的连接.连接的当前状态是关闭的

问题描述

好的，我在本周早些时候询问了这个非常错误的问题，并得到了一些非常有用的答案，毫无疑问，自从我开始遵循这些建议以来，情况已经有了很大的改善.

Ok, I asked about this very error earlier this week and had some very helpful answers and without doubt things have drastically improved since I started following the suggestions.

但是，现在我正在使用正确"的最佳实践方法来访问数据库，我仍然在某些函数上遇到此错误，并且我无法让它在该块中消失.这是我的代码:

However, now I am using the 'correct', best practice method to access the database I still get this error on some functions and I cannot get it to disappear for that block. Here is my code:

    Public Shared Function doesBasketExist(ByVal baskethash As String) As Boolean
    Dim _r As Boolean
    Using db As New SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings("pitstopConnectionString").ConnectionString)
        Using cmd As New SqlCommand("doGetBasketByHash", db)
            cmd.CommandType = CommandType.StoredProcedure
            cmd.Parameters.AddWithValue("@baskethash", baskethash)
            Using dr As SqlDataReader = cmd.ExecuteReader()
                If dr.HasRows() = True Then
                    _r = True
                Else
                    _r = False
                End If
                dr.Close()
            End Using
        End Using
    End Using
    Return _r
End Function

现在无论我做什么，我都会得到:ExecuteReader 需要一个开放且可用的连接.连接的当前状态是关闭的.在这个连接上.我确实有在这个类中调用相同对象的函数(cmd、dr 等)，但 Using 在其自身之后关闭，不是吗?

Now no matter what I do I get: ExecuteReader requires an open and available Connection. The connection's current state is closed. on this connection. I do have functions with objects called the same thing within this class (cmd, dr etc.) but Using closes up after itself doesn't it?

欢迎提出建议:)

推荐答案

我想你忘记打开连接了.

I think you have forgotten to open the connection.

在这一行之前打开它:

cmd.Parameters.AddWithValue("@baskethash", baskethash)

使用 -

db.Open()

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