如何通过单击按钮正确打开另一个 C# windows 窗体？

Question

![在此处输入图像描述][1]我想设计一个 c# windows 窗体，当用户单击按钮时，会打开一个新窗体并获取一些值。然后我以父形式使用该值。 但是当我启动程序并单击按钮时，Visual Studio 会打开一个空白的 win 表单，而我预计它会打开我之前设计的子表单。 那么是什么原因呢？我找不到任何解决方案。你的想法是什么？ 以下是代码：

---

表格1

private void button1__Click(object sender, EventArgs e)
        {
            Form2 f = new Form2();
            f.Show();
        }

表格2

        using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Date_Time
{

    public partial class Form2 : Form
    {
        private Label label1;
        private Label label2;
        private Label label3;
        private TextBox txtYear;
        private TextBox txtMonth;
        private Button btnOk;
        private TextBox txtDay;

        public void InitializeComponent()
        {
            this.label1 = new System.Windows.Forms.Label();
            this.label2 = new System.Windows.Forms.Label();
            this.label3 = new System.Windows.Forms.Label();
            this.txtYear = new System.Windows.Forms.TextBox();
            this.txtMonth = new System.Windows.Forms.TextBox();
            this.txtDay = new System.Windows.Forms.TextBox();
            this.btnOk = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // label1
            // 
            this.label1.AutoSize = true;
            this.label1.Location = new System.Drawing.Point(12, 9);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(91, 13);
            this.label1.TabIndex = 0;
            this.label1.Text = "Change in Years: ";
            // 
            // label2
            // 
            this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(13, 36);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(99, 13);
            this.label2.TabIndex = 1;
            this.label2.Text = "Change in Months: ";
            // 
            // label3
            // 
            this.label3.AutoSize = true;
            this.label3.Location = new System.Drawing.Point(13, 62);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(88, 13);
            this.label3.TabIndex = 2;
            this.label3.Text = "Change in Days: ";
            // 
            // txtYear
            // 
            this.txtYear.Location = new System.Drawing.Point(109, 6);
            this.txtYear.Name = "txtYear";
            this.txtYear.Size = new System.Drawing.Size(100, 20);
            this.txtYear.TabIndex = 3;
            // 
            // txtMonth
            // 
            this.txtMonth.Location = new System.Drawing.Point(109, 33);
            this.txtMonth.Name = "txtMonth";
            this.txtMonth.Size = new System.Drawing.Size(100, 20);
            this.txtMonth.TabIndex = 4;
            // 
            // txtDay
            // 
            this.txtDay.Location = new System.Drawing.Point(109, 59);
            this.txtDay.Name = "txtDay";
            this.txtDay.Size = new System.Drawing.Size(100, 20);
            this.txtDay.TabIndex = 5;
            // 
            // btnOk
            // 
            this.btnOk.ImageKey = "(none)";
            this.btnOk.Location = new System.Drawing.Point(73, 85);
            this.btnOk.Name = "btnOk";
            this.btnOk.Size = new System.Drawing.Size(75, 23);
            this.btnOk.TabIndex = 6;
            this.btnOk.Tag = "";
            this.btnOk.Text = "&Ok";
            this.btnOk.UseVisualStyleBackColor = true;
            // 
            // Options
            // 
            this.ClientSize = new System.Drawing.Size(238, 120);
            this.Controls.Add(this.btnOk);
            this.Controls.Add(this.txtDay);
            this.Controls.Add(this.txtMonth);
            this.Controls.Add(this.txtYear);
            this.Controls.Add(this.label3);
            this.Controls.Add(this.label2);
            this.Controls.Add(this.label1);
            this.Name = "Options";
            this.Text = "Options";
            this.ResumeLayout(false);
            this.PerformLayout();

        }
    }
}

Answer 1

抱歉耽搁了朋友们的时间。在@user3189142 和Yorye 的帮助下，我终于找到了原因。 :) 谢谢！

子表单（选项）不完整。它缺少以下代码：

---

 public Options()
    {
        InitializeComponent();
    }

谢谢大家。

Answer 2

乍一看，最让我印象深刻的是你的第二种形式是这样定义的：

public partial class Options : Form
{
    //code
}

但是当您尝试向用户展示它时，您使用的是Form2 类而不是Options 类。尝试将您的 button1_Click 更改为以下内容：

private void button1__Click(object sender, EventArgs e)
{
    Options opt = new Options();
    opt.Show();
}

您可能还想确保Options 表单的构造函数正在调用InitializeComponent 方法：

public partial class Options : Form
{
    public Options()
    {
        InitializeComponent();
    }

    private void btnOk_Click(object sender, EventArgs e)
    {
        //Coding for your Options' Form ok button
    }
}

Answer 3

private void button1__Click(object sender, EventArgs e)
{
   Form2 newForm = new Form2();
   newForm.ShowDialog();

   // here you can take your parameters
   int x = newForm.x;
   int y = newForm.y;
}


// you should have definitions for x and y in your child form
public partial class Form2: Form
{
   public int x{get; set;}
   public int y{get; set;}

   public Form2(){}

   // do stuff
}