如何将值从Form1传递到Form2 [英] How to pass value from Form1 to Form2

问题描述

我正在制作一个生成SQL Server代码的程序，以便在我的VB.NET程序中使用它。

I'm making a program that generates SQL Server code to use it in my VB.NET program.

我有第一个包含您这样的连接的表格参见下图：

I have this first form that contains the connection like you see in picture below:

连接有效100％，但是在第二个表单中有两个 DataGridView s，一个用于表，一个用于字段。

The connection works 100%, but in the second form I have two DataGridViews, one for tables and one for fields.

因此，当我单击任何表时 DataGridView1 => DataGridView2 的显示字段：

So when I click on any table of DataGridView1 => DataGridView2 show it fields:

当我单击 DataGridView1 来获取 ComboBox的值时 Form1 中的在 Form2 中使用它我遇到以下错误：

When I click on DataGridView1 to get the value of ComboBox from Form1 to use it in Form2 I have the following error:

无法连接到服务器。

Failed to connect to server.

代码：

Dim frm As New Form2
prd.ServerConnection = New ServerConnection(frm.ComboServer.Text) ' here the error
prd.DGVField(MetroGridTables, MetroGridField)

我使用 Form1 进行连接，并使用 Form2 进行操作。

I use Form1 to make connection and Form2 to make operation.

推荐答案

将值从一种形式传递给另一种形式的最简单方法是实现 New 要将值传递给的方法：

The simplest way to pass a value from one form to another is to implement the New method on the form you want to pass the value to:

Form1 ：

Public Class Form1

    Private Sub btnPass_Click(sender As Object, e As EventArgs) Handles btnPass.Click

        Dim form As New Form2(TextBox1.Text)
        form.Show()

    End Sub

End Class

Form2 ：

Public Class Form2

    Public Sub New(ByVal value As String)

        ' This call is required by the designer.
        InitializeComponent()

        Label1.Text = value

    End Sub

End Class

截图：

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