C# Inputbox 方法 VS2019

2024-04-11 by noodlejay 發表留言

C# Windows form 並沒有內建Inputbox，我以前的做法是透過另一個Form來當作輸入視窗。

後來找到兩個不錯的方法，提供參考。

<方法一>使用Microsoft.VisualBasic.dll

01.方案上案右鍵→加入→參考

02.找到Microsoft.VisualBasic →勾選→確定

03.加入 using Microsoft.VisualBasic;

04.在Button加入底下程式

  string input_str;
  input_str = Interaction.InputBox("請輸入數值", "提示", "");
  if (string.IsNullOrEmpty(input_str))
  {
                return;
  }
  else 
  {
  MessageBox.Show(input_str,"資訊", MessageBoxButtons.OK, MessageBoxIcon.Information);            
  }

05.結果：

<方法二>使用System.Windows.Forms.dll 和 System.Drawing.dll 。

01.同方法一，加入兩個參考。

02.加入using

using System;
using System.Windows.Forms;
using System.Drawing;

03.測試底下程式碼

加入底下的方法

private static DialogResult ShowInputDialogBox(ref string input, string prompt,
                   string title = "Title", int width = 300, int height = 200)
 {
// This function creates the custom input dialog box by individually creating the different
            // window elements and adding them to the dialog box

            // Specify the size of the window using the parameters passed
            Size size = new Size(width, height);
            // Create a new form using a System.Windows Form
            Form inputBox = new Form();

            inputBox.FormBorderStyle = FormBorderStyle.FixedDialog;
            inputBox.ClientSize = size;
            // Set the window title using the parameter passed
            inputBox.Text = title;

            // Create a new label to hold the prompt
            Label label = new Label();
            label.Text = prompt;
            label.Location = new Point(5, 5);
            label.Width = size.Width - 10;
            inputBox.Controls.Add(label);

            // Create a textbox to accept the user's input
            TextBox textBox = new TextBox();
            textBox.Size = new Size(size.Width - 10, 23);
            textBox.Location = new Point(5, label.Location.Y + 20);
            textBox.Text = input;
            inputBox.Controls.Add(textBox);

            // Create an OK Button
            Button okButton = new Button();
            okButton.DialogResult = DialogResult.OK;
            okButton.Name = "okButton";
            okButton.Size = new Size(75, 23);
            okButton.Text = "&OK";
            okButton.Location = new Point(size.Width - 80 - 80, size.Height - 30);
            inputBox.Controls.Add(okButton);

            // Create a Cancel Button
            Button cancelButton = new Button();
            cancelButton.DialogResult = DialogResult.Cancel;
            cancelButton.Name = "cancelButton";
            cancelButton.Size = new Size(75, 23);
            cancelButton.Text = "&Cancel";
            cancelButton.Location = new Point(size.Width - 80, size.Height - 30);
            inputBox.Controls.Add(cancelButton);

            // Set the input box's buttons to the created OK and Cancel Buttons respectively so the window
            // appropriately behaves with the button clicks
            inputBox.AcceptButton = okButton;
            inputBox.CancelButton = cancelButton;

            // Show the window dialog box
            DialogResult result = inputBox.ShowDialog();
            input = textBox.Text;

            // After input has been submitted, return the input value
            return result;
        }

04.呼叫

            string test = ""; // 回傳值

            ShowInputDialogBox(ref test, "你今天學會了嗎?", "標題", 300, 200);

            // Print the input provided by the user
            Console.WriteLine(test);

05.結果