Question

更新：如果文件夹存在，我想要一个文本框说“缓存存在”，如果文件夹不存在，我想要“缓存删除”

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

    private void button1_Click(object sender, EventArgs e)
    {
        var pathWithEnv = @"%USERPROFILE%\.rsclient";
        var aslcache = Environment.ExpandEnvironmentVariables(pathWithEnv);
        System.IO.Directory.Delete(aslcache, true);
    }

    private void textBox1_TextChanged(object sender, EventArgs e)
    {
        string curFile = @"%USERPROFILE%\.rsclient";
        Console.Write(Directory.Exists(curFile) 
            ? textBox1.Text = "Cache exists." 
            : "Cache has been deleted.");
    }
}

编辑：用Lews Therin的答案更新了代码。

private void updateTextBox()
{
   string curFile = @"%USERPROFILE%\.rsclient";
   textBox1.Text = Directory.Exists(curFile) ? "Cache exists." :
   "Cache has been deleted.";
}

private void button1_Click(object sender, EventArgs e)
{
   var pathWithEnv = @"%USERPROFILE%\.rsclient";
   var aslcache = Environment.ExpandEnvironmentVariables(pathWithEnv);
   System.IO.Directory.Delete(aslcache, true);
   updateTextBox();
}

我收到错误：

错误1'WindowsFormsApplication1.Form1'不包含定义对于'textBox1_TextChanged'并没有扩展方法 'textBox1_TextChanged'接受第一个类型的参数可以找到'WindowsFormsApplication1.Form1'（你错过了吗？使用指令或程序集引用？） C：\ Users \ 4p \ Documents \ Visual Studio 2013 \ Projects \ cache deleter csharp \ cache deleter csharp \ Form1.Designer.cs 53 71缓存删除器 CSHARP

Answer 1

我想你想要：

private void updateTextBox()
{
    string curFile = @"%USERPROFILE%\.rsclient";
    textBox1.Text = Directory.Exists(curFile)? "Cache exists." :
        "Cache has been deleted.";
}

private void button1_Click(object sender, EventArgs e)
{
    var pathWithEnv = @"%USERPROFILE%\.rsclient";
    var aslcache = Environment.ExpandEnvironmentVariables(pathWithEnv);
    System.IO.Directory.Delete(aslcache, true);
    updateTextBox();
}

Answer 2

在Form构造函数中检查文件是否存在使用 File.Exists（路径）[MSDN：http://msdn.microsoft.com/en-us/library/system.io.file.exists.aspx]

if (File.Exists(path)) {
textbox.text = "file exists"
}else {
textbox.text = "file doesn't exist"
{

删除文件后，如果需要，可以再次更改textBox文本。

我想要一个指示（在文本框中）文件夹不存在

2 个答案: