c# - 我收到错误 "System.Array does not contain a definition for LastWriteTime"

Question

我的 C# 代码有问题我似乎无法让我的 if 语句工作我认为它出于某种原因试图引用错误的代码部分。我已经检查过我是否拥有所有正确的引用资料和所有正确的用途。我已将有问题的代码粘贴到下面:

FolderBrowserDialog dlg2 = new FolderBrowserDialog();
if (dlg2.ShowDialog() == DialogResult.OK)
//do whatever with dlg.SelectedPath
{

    string searchPattern = "*";
    DirectoryInfo source = new DirectoryInfo(dlg.SelectedPath);
    DirectoryInfo target = new DirectoryInfo(dlg2.SelectedPath);

    DirectoryInfo dir = new DirectoryInfo(dlg.SelectedPath);
    FileInfo[] fi = dir.GetFiles("*", SearchOption.AllDirectories);
    {
        if (fi.LastWriteTime.Date == DateTime.Today.Date)
        {
            FileInfo[] sourceFiles = source.GetFiles(searchPattern, SearchOption.AllDirectories);
            for (int i = 0; i < sourceFiles.Length; ++i)
                File.Copy(sourceFiles[i].FullName, target.FullName + "\\" + sourceFiles[i].Name, true);
        }
    }

如能提供任何帮助，我们将不胜感激。

Answer 1

你想做的大概是这个吧？

        FileInfo[] fis = dir.GetFiles("*", SearchOption.AllDirectories);
        foreach (FileInfo fi in fis)
        {
            if (fi.LastWriteTime.Date == DateTime.Today.Date)
            {
                FileInfo[] sourceFiles = source.GetFiles(searchPattern, SearchOption.AllDirectories);
                for (int i = 0; i < sourceFiles.Length; ++i)
                    File.Copy(sourceFiles[i].FullName, target.FullName + "\\" + sourceFiles[i].Name, true);
            }
        }