创建目录不会将 Exists 属性更新为 true

Question

我有以下示例代码。

private DirectoryInfo PathDirectoryInfo
{
    get
    {
        if (_directoryInfo == null)
        {
            // Some logic to create the path
            // var path = ...
            _directoryInfo = new DirectoryInfo(path);
        }
        return _directoryInfo;
    }
}

public voide SaveFile(string filename)
{
    if (!PathDirectoryInfo.Exists)
    {
         PathDirectoryInfo.Create();
    }

     // PathDirectoryInfo.Exists returns false despite the folder has been created.
     bool folderCreated = PathDirectoryInfo.Exists;  // folderCreated  == false

    // Save the file
    // ...
}

根据MSDN：

Exists property: true if the file or directory exists; otherwise, false.

为什么创建目录后存在 returns false？我错过了什么吗？

Answer 1

您可以将属性更改为：

private DirectoryInfo PathDirectoryInfo
{
    get
    {
        if (_directoryInfo == null)
        {
            // Some logic to create the path
            // var path = ...
            _directoryInfo = new DirectoryInfo(path);
        }
        else
        {
            _directoryInfo.Refresh();
        }

        return _directoryInfo;
    }
}

这将确保您在获得属性值时始终使用当前信息。

就是说，如果您在这期间没有再次获得属性值，这对您没有帮助。不过你是你的情况。

创建目录不会将 Exists 属性更新为 true

Creating Directory doesn't update the Exists property to true

c#

io

fileinfo

directoryinfo

创建目录不会将 Exists 属性 更新为 true

Creating Directory doesn't update the Exists property to true

c#

io

fileinfo

directoryinfo

创建目录不会将 Exists 属性更新为 true