C# iPhone System.IO.File.Exists（）不工作

以下指令检查路径处的文件是否存在：

string path = GetiPhoneDocumentsPath();
if (System.IO.File.Exists(path) == false) XmlTextWriter textWriter = new XmlTextWriter(path,null);

然后，如果文件不存在，它会创建一个新文件，它在unity执行中运行良好，但是当我在iphone中执行程序时，该文件永远不会被创建

以下是获取路径的函数：

public static string GetiPhoneDocumentsPath()
{
    // Your game has read+write access to /var/mobile/Applications/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/Documents 
    // Application.dataPath returns              
    // /var/mobile/Applications/XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX/myappname.app/Data 
    // Strip "/Data" from path 
    string path = Application.dataPath.Substring(0, Application.dataPath.Length - 5);
    // Strip application name 
    path = path.Substring(0, path.LastIndexOf('/'));
    return path + "/Documents/myFile.xml";
}

明白了

FileInfo info = new FileInfo(path);
    if (info == null || info.Exists == false) { ... };