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我是 vb .net 编程的新手，当我尝试将表单按钮连接到 MySql 数据库时遇到以下错误： System.Data.dll 中发生“System.ArgumentException”类型的未处理异常附加信息：不支持关键字。我一直在努力解决这个错误，但我没有成功。感谢您提供的任何帮助！请参阅以下课程的我的代码：

导入 MySql.Data.MySqlClient 公共类 Form1

Dim connect As New MySqlConnection

Dim connecto As String = "Server=localhost; User Id=root; Password; Database=sist"
Private Sub GroupBox1_Enter(sender As Object, e As EventArgs) Handles GroupBox1.Enter

End Sub

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    connect.ConnectionString = connecto
    Try
        connect.Open()
        MessageBox.Show("Connected Successfully")
    Catch ex As MySqlException
        MessageBox.Show(ex.Message)
    End Try


End Sub

Private Sub TextBox1_TextChanged(sender As Object, e As EventArgs) Handles TextBox1.TextChanged

End Sub

Private Sub Label4_Click(sender As Object, e As EventArgs) Handles Label4.Click

End Sub

Private Sub Timer1_Tick(sender As Object, e As EventArgs) Handles Timer1.Tick
    Label4.Text = Date.Now.ToString("MMM dd yyyy hh:mm:ss")
End Sub

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    Timer1.Enabled = True
End Sub

Private Sub LinkLabel1_LinkClicked(sender As Object, e As LinkLabelLinkClickedEventArgs)

End Sub

结束类

4

1 回答 1

1 
connect.ConnectionString = connecto

您在 Button1_Click 子中的第一行引用了 connect 和 connecto。但是这些对象超出了 sub 的范围。您可以将实例移动到 sub 内，它会起作用。

所以：

Dim connect As New MySqlConnection
Dim connecto As String = "Server=localhost; User Id=root; Password; Database=sist"
connect.ConnectionString = connecto
    Try
        connect.Open()
        MessageBox.Show("Connected Successfully")
    Catch ex As MySqlException
        MessageBox.Show(ex.Message)
    End Try

或者更好

Dim connecto As String = "Server=localhost; User Id=root; Password; Database=sist"

Using connect As New MySqlConnection(connecto)
        Try
            connect.Open()
            MessageBox.Show("Connected Successfully")
        Catch ex As MySqlException
            MessageBox.Show(ex.Message)
        End Try
End Using
于 2014-10-23T20:18:11.773 回答