如何使用 C# 仅当文件不存在时才将文件添加到文件夹
我在文件夹“ c:\template_folder”中有一个模板文件。
在运行时，我将创建一个新文件夹“ c:\new_folder”，并且仅当文件不存在时才将模板文件复制到 new_folder 。
描述： 第一次，我会将模板文件复制到 new_folder 并用用户名重命名它...这样在第一次循环完成后，我将有 8 个 excel 文件，其中用户名作为每个文件的名称。
对于第二个循环，如果我必须将模板文件复制到 new_folder 并将其重命名为用户名，如果具有用户名的文件已经存在，则不应将文件复制到该文件夹。
我添加了代码片段以供参考。
foreach (FileInfo fi in templateFile)
{
string oldfilename = null;
string newfilename = null;
if (dir.Exists)
{
fi.CopyTo(Path.Combine(dir.ToString(), fi.Name));
FileInfo fileName = new FileInfo(fi.Name);
oldfilename = Path.Combine(dir.ToString(), fileName.ToString());
newfilename = Path.Combine(dir.ToString(), tempUserName + " " + "E" + tempUserID + " VIPv7.0.xls");
//if( !dir.ToString().Contains(newfilename))
foreach( FileInfo fileList in fileNames)
{
if (fileList.Exists == false)
File.Move(oldfilename, newfilename);
}
}
}
请帮助我完成这项工作。
谢谢 拉姆
I have a template file in a folder " c:\template_folder".
At runtime, I will create a new folder " c:\new_folder" and wish to copy the template file to the new_folder only if the file doesnt exist.
description:
for the first time, I will copy the template file to the new_folder and rename it with username... so that after first time the loop finishes, i will have 8 excel files with username as the name of the each file.
for the second loop, if I have to copy the template file to new_folder and rename it to the username, if the file with the user name already exists, then it shouldnt copy the file to the folder.
I am addin the snippet of the code for reference.
foreach (FileInfo fi in templateFile)
{
string oldfilename = null;
string newfilename = null;
if (dir.Exists)
{
fi.CopyTo(Path.Combine(dir.ToString(), fi.Name));
FileInfo fileName = new FileInfo(fi.Name);
oldfilename = Path.Combine(dir.ToString(), fileName.ToString());
newfilename = Path.Combine(dir.ToString(), tempUserName + " " + "E" + tempUserID + " VIPv7.0.xls");
//if( !dir.ToString().Contains(newfilename))
foreach( FileInfo fileList in fileNames)
{
if (fileList.Exists == false)
File.Move(oldfilename, newfilename);
}
}
}
please help me in working this.
thanks
ramm
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评论（3）
仅当文件尚不存在时才有条件地移动文件，您可以这样做：
您的代码片段让我感到困惑，所以我希望我已经正确回答了您的问题。 如果我遗漏了什么，请告诉我。
To conditionally move a file only if it doesn't already exist you would do it like this:
Your code snippet confuses me, so I hope I've answered your question correctly. If I'm missing something please let me know.
您的代码对我来说似乎不正确（它无法编译），但您可以通过调用 File.Exists(filename) 检查文件是否存在，因此：
Your code doesn't seem correct to me (it doesn't compile), but you can check if a file exists by calling File.Exists(filename), so:
您想使用 File.Exists(path) 而不是注释掉的行来检查文件是否存在
You want to use File.Exists(path) instead of the commented out line to check if the file exists