C# 如果文件存在，则自动选中复选框

我想创建一个程序，这样如果文件存在，复选框将自动检查

private void button3_Click(object sender, EventArgs e)
{
  //check whether the file is exist or not
  if (string curFile = @"C:\s\test.txt")
  {

  }
  else
  {

  }
}

---

File.Exists（fileLocation）

返回bool

必须使用System.IO验证文件是否存在，然后将atributte.checked设置为true。大概是这样的：

    if System.IO.File.Exists(@"C:\s\test.txt") {
        yourcheckbox.checked = true
    }
    else {
        yourcheckbox.checked = false
    }

bool didItExist = File.Exists(@"c:\path\to\file.txt");
checkbox.Checked = didItExist;

由于

File.Exists（）

返回

true

或

false

，因此可以直接使用返回值：

yourcheckbox.Checked = File.Exists(@"c:\Path\To\File.txt");

这就相当于做这样的事情：

    if System.IO.File.Exists(@"C:\s\test.txt") {
        yourcheckbox.checked = true
    }
    else {
        yourcheckbox.checked = false
    }

bool didItExist = File.Exists(@"c:\path\to\file.txt");
checkbox.Checked = didItExist;

和/或这个

checkbox.Checked = File.Exists(@"c:\path\to\file.txt") ? true : false;

不要忘记使用System.IO添加

位于顶部，因为
File.Exists（）
从中派生

我认为第一个建议的替代方案是最简洁的方法

跟进你的评论。。。下面是一个功能完整的代码片段

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

namespace AutoCheckCheckbxIfFileExist_45245562
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            /*
             * I'm adding the fields dynamically through code so that
             * you know all the fields that are on my form.
             * Because they are created dynamically, I'll use 'Find' later on
             * to retrieve them.
             */
            addButton();
            addTextField();
            addChkbx();
        }

        private void addChkbx()
        {

            /*
             * This is the checkbox that will be dyamically checked or unchecked
             */
            CheckBox chkbx = new CheckBox();
            chkbx.Location = new Point(this.Location.X + 35, this.Location.Y + 55);
            chkbx.Name = "thechkbx";
            this.Controls.Add(chkbx);
        }

        private void addTextField()
        {
            /*
             * This is the field I'll be looking at to pull the file path
             */
            TextBox txtb = new TextBox();
            txtb.Name = "txtbx_thebox";
            txtb.Location = new Point(this.Location.X + 5, this.Location.X + 35);
            this.Controls.Add(txtb);
        }

        private void addButton()
        {
            /*
             * This will be the button you'll click on to get the check/uncheck behavior
             */
            Button btn = new Button();
            btn.Text = "ClickMe";
            btn.Click += Btn_Click;
            btn.Location = new Point(this.Location.X + 5, this.Location.Y + 5);
            this.Controls.Add(btn);
        }

        private void Btn_Click(object sender, EventArgs e)
        {
            /*
             * This is the answer to your question
             * Because I dynamically create the fields, I'm using a Find to get them and use them.
             */
            ((CheckBox)this.Controls.Find("thechkbx", true)[0]).Checked = File.Exists(((TextBox)this.Controls.Find("txtbx_thebox", true)[0]).Text);


        }
    }
}

在代码顶部包括“Using System.IO”。之后：这一行是一个示例：checkBox1.Checked=File.Exists（@“c:\PathToFile\File.txt”）？true:false；checked=Checkedit不起作用，在我运行代码后，复选框仍然取消选中。