Question

我目前正在学习ASP.NET MVC 4。

我想显示位于网页目录中的.cs和.cpp个文件。但不知怎的，我得到多个文件类型显示的异常。

下面的代码行给出了异常：

string pattern ="*.cs|*.cpp";

直到现在我写下了代码：

public ActionResult Contact()
{
    string pattern = "*.cs";
    //string pattern ="*.cs|*.cpp";  // this line does not work  
    ViewBag.Message = "Your contact page.";
    DirectoryInfo dirInfo = new DirectoryInfo(@"f:\");
    List<string> filenames = dirInfo.GetFiles(pattern).Select(i => i.Name).ToList();
    ViewBag.data = filenames;
    return View(filenames);
}

View代码如下：

@{
    ViewBag.Title = "Contact";
}
<hgroup class="title">
    <h1>@ViewBag.Title.</h1>
    <h2>@ViewBag.Message</h2>
</hgroup>
<table bgcolor="#00FF00">
    @foreach (var item in (List<string>)ViewBag.data)
    {
        <tr>
            <th>@item   <br></th>

        </tr>
    }
</table>

Answer 1

DirectoryInfo.GetFiles(pattern)仅允许单一模式。它与创建公共对话框时设置的过滤器不同。

如果你想要多个模式，你可以创建自己的扩展方法，这里有一些例子:: GetFiles with multiple extensions

Answer 2

你需要做这样的事情：

        string pattern = "*.cs";
        ViewBag.Message = "Your contact page.";
        DirectoryInfo dirInfo = new DirectoryInfo(@"f:\");
        List<string> filenames = new List<string>();
        foreach (FileInfo f in dirInfo.GetFiles(pattern))
        {
            filenames.Add(f.Name);  //or f.FullName to include path
        }
        pattern = "*.cpp";
        foreach (string f in dirInfo.GetFiles(pattern))
        {
            filenames.Add(f);
        }

        ViewBag.data = filenames;
        return View(filenames);

或类似的东西：

        public ActionResult Contact()
    {

        string pattern = "*.cs|*.cpp";
        ViewBag.Message = "Your contact page.";
        DirectoryInfo dirInfo = new DirectoryInfo(@"f:\");
        List<string> filenames = new List<string>();
        string[] temp = pattern.Split('|');
        for (int i = 0; i < temp.Length; i++)
        {
            filenames.AddRange(GetFiles(temp[i]));
        }
        ViewBag.data = filenames;
        return View(filenames);
    }

    public List<string> GetFiles(string pattern) {
        DirectoryInfo dirInfo = new DirectoryInfo(@"f:\");
        List<string> filenames = new List<string>();
        foreach (FileInfo f in dirInfo.GetFiles(pattern))
        {
            filenames.Add(f.Name);  //or f.FullName to include path
        }
        return filenames;
    }

关于这一点的好处是，您有机会进行排序，并在将列表返回到您的视图之前进一步过滤列表。

在ASP.NET MVC 4 Project中显示目录中的文件类型

2 个答案: