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Make a Generic Search Form in a Visual Basic .NET

Thực hiện một Generic Mẫu tìm kiếm trong một Visual Basic NET Desktop. Ứng dụng tiện ích hữu dụng khác mà lợi dụng dữ liệu đang được định hướng là một hình thức tìm kiếm tiêu chuẩn mà bạn có thể sử dụng cho bất kỳ số lượng bàn, chẳng hạn như khách hàng, nhân viên | 8.4 Make a Generic Search Form in a Visual Basic .NET Desktop Application Another useful utility that takes advantage of being data driven is a standard search form that you can use for any number of tables such as customers employees or products. This How-To shows you how to create such a Windows Form so that all you need to use it with different tables is to set four custom properties of the form in code. You like to be able to provide a usable search form for my users without having the hassle of creating a custom form for every topic that the users are maintaining. In this How-To you will see how to create a form that provides a quick lookup for records and can be used with various topics such as Customers and Employees by setting up only a few custom properties on the search form. Technique The forms package of Visual Basic has a class module behind it where you can add your own properties and methods. The .NET version of it is no exception. In this How-To you will see a simple use for custom properties that are being added to a form. Properties can be specified on a form by adding the following syntax to your form Public Property PropertyName As DataType Get PropertyName ModuleLevelMemoryVariable End Get Set ByVal Value As DataType ModuleLevelMemoryVariable Value End Set End Property With the ModuleLevelMemoryVariable being declared in the module declaration area of the form s class module you can see the properties created for the search form called frmHowTo8_b.vb in Listing 8.16. Listing 8.16 frmHowTo8_4b.vb Creating Custom Properties for the Search Form Private mstrDisplayName As String Private mstrRecordSource As String Private mstrSearchField As String Private moResultValue As Object Private mstrKeyField As String Public Property DisplayName As String Get DisplayName mstrDisplayName End Get Set ByVal Value As String mstrDisplayName Value End Set End Property Public Property SearchRecordSource As String Get SearchRecordSource mstrRecordSource End Get Set