Question

我认为如果我可以计算出一生的符号，这可能会有效，我错了吗？

    Try
    'Setup Connection String
    conn.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source= " & Application.StartupPath & "\igcDatabase.accdb"
    sqlCom.Connection = conn

    'Open Data Connection
    conn.Open()

    If rbMemberID.Checked = True Then
        'Query
        sqlCom.CommandText = "SELECT * FROM [Members] WHERE [Member ID] = @MemberID"

        'Parameter is used below to prevent SQL Injection
        sqlCom.Parameters.AddWithValue("MemberID", txtSearchInput.Text)
    Else
        MessageBox.Show("If you are not getting the result you wanted, try again with Member ID.", "", MessageBoxButtons.OK, MessageBoxIcon.Information)
        'Query
        sqlCom.CommandText = "SELECT * FROM [Members] WHERE [Member First Name] = @FirstName"

        'Parameter is used below to prevent SQL Injection
        sqlCom.Parameters.AddWithValue("FirstName", txtSearchInput.Text)
    End If

    Dim sqlRead As OleDbDataReader = sqlCom.ExecuteReader()
    sqlRead.Read()

    If sqlRead.HasRows = True Then
        Dim membershipType As String
        If sqlRead.GetValue(4) = 1 Then
            membershipType = "Deluxe"
        ElseIf sqlRead.GetValue(4) = 2 Then
            membershipType = "Non-Deluxe"
        Else
            membershipType = "Week-Day"
        End If

        txtMemberID.Text = sqlRead.GetValue(0)
        txtFirstName.Text = sqlRead.GetString(1)
        txtLastName.Text = sqlRead.GetString(2)
        txtGender.Text = sqlRead.GetString(3)
        txtContact.Text = sqlRead.GetValue(5)
        txtEmail.Text = sqlRead.GetString(6)
        txtMembershipType.Text = membershipType
        txtEntyDate.Text = sqlRead.GetDateTime(7)
        txtStatus.Text = sqlRead.GetString(8)
    Else
        MessageBox.Show("There Is no such member found in database. Please Try again.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Warning)
        txtMemberID.Clear()
        txtFirstName.Clear()
        txtLastName.Clear()
        txtGender.Clear()
        txtContact.Clear()
        txtEmail.Clear()
        txtMembershipType.Clear()
        txtStatus.Clear()
        txtEntyDate.Clear()
        txtSearchInput.Clear()
        txtSearchInput.Select()
    End If
    sqlCom.Parameters.Clear()
    sqlRead.Close()
    conn.Close()
Catch ex As Exception
    MessageBox.Show(ex.Message)
End Try

Answer 1

匹配只适用于具体类型，所以答案是否定的。除了我们可以在其上调用T中定义的方法（用于在字符串中搜索）之外，对此类型Pattern一无所知。

我可以针对实现Pattern的泛型类型创建匹配吗？

1 个答案: