Question

我正在学习c＃。我想动态创建一些控件。这是我试图在表单上动态创建新元素的代码，但它没有做任何事情。请帮我解决这个问题。

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

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

        int n = 4;

        private void btnDisplay_Click(object sender, EventArgs e)
        {
            TextBox[] textBox = new TextBox[n];
            Label[] label = new Label[n];

            for (int i = 0; i < n; i++)
            {
                textBox[i] = new TextBox();
                textBox[i].Name = "n" + i;
                textBox[i].Text = "n" + i;

                label[i] = new Label();
                label[i].Name = "n" + i;
                label[i].Text = "n" + i;
            }

            for (int i = 0; i < n; i++)
            {
                this.Controls.Add(textBox[i]);
                this.Controls.Add(label[i]);
            }
        }
    }
}

Answer 1

您将所有控件添加到彼此之上，这就是为什么看起来只有其中一个。您需要将它们放在某种基于布局的控件/面板（例如FlowLayoutPanel）中，它将根据您需要的布局类型自动将结构放置在适当的位置。

Answer 2

我刚在Visual Studio中编写了一个快速的C＃项目。下面的代码在表单中添加了一个新的文本框。

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

namespace WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        TextBox txtBox;


        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            txtBox = new TextBox();
            txtBox.Location = new Point(10, 50);
            txtBox.Visible = true;
            Controls.Add(txtBox);
        }
    }
}

------------------------------------------ ADDED ---- ---------------------------------

下面的代码将添加4个文本框和4个标签，就像您想要的那样。你可以看到图片（在代码的最后），它在我的例子中的显示方式。

P.s。：您需要正确配置位置。

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

namespace WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        TextBox[] txtBox;
        Label[] lbl;

        int n = 4;
        int space = 20;

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            txtBox = new TextBox[n];
            lbl = new Label[n];

            for (int i = 0; i < n; i++)
            {
                txtBox[i] = new TextBox();
                txtBox[i].Name = "n" + i;
                txtBox[i].Text = "n" + i;

                lbl[i] = new Label();
                lbl[i].Name = "n" + i;
                lbl[i].Text = "n" + i;
            }


            for (int i = 0; i < n; i++)
            {
                txtBox[i].Visible = true;
                lbl[i].Visible = true;
                txtBox[i].Location = new Point(40, 50 + space);
                lbl[i].Location = new Point(10, 50 + space);
                this.Controls.Add(txtBox[i]);
                this.Controls.Add(lbl[i]);
                space += 50;
            }

        }
    }
}

屏幕截图：http://shrani.si/f/1F/Y/22BgTuBX/example.png

我也花时间把我上传的项目上传到Sendspace。

下载链接：http://www.sendspace.com/file/glc7h2

Answer 3

文本框和标签位于彼此之上，因为您没有为它们指定位置。

将您的代码更改为：

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

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

        int n = 4;

        private void btnDisplay_Click(object sender, EventArgs e)
        {
            TextBox[] textBox = new TextBox[n];
            Label[] label = new Label[n];
            int labelX, labelY, textboxX, textboxY;

            labelX = 20;
            labelY = 20;
            textboxX = 50;
            textboxY = 20;

            for (int i = 0; i < n; i++)
            {
                textBox[i] = new TextBox();
                textBox[i].Name = "n" + i;
                textBox[i].Text = "n" + i;
                textBox[i].Location = new Point(textboxX, textboxY);

                label[i] = new Label();
                label[i].Name = "n" + i;
                label[i].Text = "n" + i;
                label[i].Location = new Point(labelX, labelY);

                labelY += 25;
                textboxY += 25;
            }

            for (int i = 0; i < n; i++)
            {
                this.Controls.Add(textBox[i]);
                this.Controls.Add(label[i]);
            }
        }
     }
}

文本框和标签将显示在2列中，每行添加25个Y值。

Answer 4

数组创建调用只是将元素初始化为null。您需要单独创建它们。试试这个

TextBox[] txtTeamNames = new TextBox[teams];
for (int i = 0; i < txtTeamNames.Length; i++) {
  var txt = new TextBox();
  txtTeamNames[i] = txt;
  txt.Name = name;
  txt.Text = name;
  txt.Location = new Point(172, 32 + (i * 28));
  txt.Visible = true;
}

Answer 5

是首先定义您要在页面中添加控件的位置，并在该主控件上添加控件。示例页面有一个面板，它的名称是pnl1，所以请使用如下

pnl1.Controls.Add(textBox[i]);
pnl1.Controls.Add(label[i]);

Answer 6

namespace Sample
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
        }
        TextBox txbx = new TextBox();
        private void button1_Click(object sender, EventArgs e)
        {
            AddNewTextBox();

            txbx = new TextBox();

            txbx.Location = new Point(10, 20);

            txbx.Visible = true;

            Controls.Add(txbx);

        }

    }
}

动态创建winforms控件

6 个答案: