Windows窗体的数据处理中存在问题. [英] Having issues in data handling of windows forms.

问题描述

亲爱的所有人，

我是C#Windows编程的新手，在处理Windows窗体的数据时遇到问题.

这是场景.

我创建了一个Windows窗体(名为form1)，在其中通过各种控件(例如文本框，列表框，组合框)进行输入，并尝试以另一种形式显示它，直到在其中显示一个Windows窗体的输入值为止.第二种形式工作正常，但是当我尝试以第三种形式访问form1的值以便基于form1值进行一些计算时，我无法访问它们.

在这种情况下，请帮助我如何访问第三种形式的form1的值.

以下是我如何执行此操作的代码

Dear All,

I am new in C# windows programming and having issues in handling data of windows forms.

Here is the scenario.

I have created one windows form (named as form1) in which i am taking input via various controls such as text boxes, list boxes, combo boxes and trying to show it in another form , till showing one windows form''s input value in second form is working fine but when I try to access values of form1 in third form in order to do some computation based on form1 values I am unable to access them.

Please help me in this scenario that how could access the values of form1 in the third form.

Following is the code that how i am doing this

namespace SmallTestApplication
{
   public partial class Form1 : Form
   {
      public Form1()
      {
         InitializeComponent();
      }

      private void button1_Click(object sender, EventArgs e)
      {
         previewinput dos = new previewinput();
         dos.Show();
         dos.label2.Text = textBox1.Text;
      }

      public string getdataform3()
      {
         Form3 form3obj = new Form3();
         form3obj.getvar = textBox1.Text;
         return form3obj.getvar;
      }
   }
}

namespace SmallTestApplication
{
   public partial class previewinput : Form
   {
      public previewinput()
      {
         InitializeComponent();
      }

      private void button1_Click(object sender, EventArgs e)
      {
         Form3 objform3 = new Form3();
         objform3.Show();
      }
   }
}

namespace SmallTestApplication
{
   public partial class Form3 : Form
   {
      public Form3()
      {
         InitializeComponent();
      }

      public string getvar;

      private void button1_Click(object sender, EventArgs e)
      {
         Form1 objform1 = new Form1();
         MessageBox.Show(objform1.textBox1.Text)
         //MessageBox.Show(objform1.getdataform3());

         //previewinput dos = new previewinput();
         //MessageBox.Show(dos.label2.Text);
      }
   }
}

谢谢，

Fahad Bin Aziz.

Thanks,

Fahad Bin Aziz.

推荐答案

这是有关表单协作的流行问题.最健壮的解决方案是在Form类中实现适当的接口，并传递接口引用而不是对Form的整个实例"的引用.请查看我过去的解决方案以获取更多详细信息:如何以两种形式在列表框之间复制所有项目 [

This is the popular question about form collaboration. The most robust solution is implementation of an appropriate interface in form class and passing the interface reference instead of reference to a "whole instance" of a Form. Please see my past solution for more detail: How to copy all the items between listboxes in two forms[^].

—SA

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