文件重命名不起作用

Question

FileInfo _fileinfo = new FileInfo(@"D:\Projects\LSImage\" + dt.Rows[0]["ApplicationImage"].ToString());         
File.Move(_fileinfo.FullName, _fileinfo.FullName.ToString().Replace(_fileinfo.FullName, dt.Rows[0]["ApplicationID"].ToString() + dt.Rows[0]["ApplicationImage"].ToString()));

It's throwing an error

Cannot create a file when that file already exists.

I have to rename images in LsImages with applicationId from database, so i am prefixing with it application and and then applicationimage name from database

Answer 1

You are replacing the full string:

File.Move(_fileinfo.FullName, _fileinfo.FullName .ToString().Replace( _fileinfo.FullName , dt.Rows[0]["ApplicationID"].ToString() + dt.Rows[0]["ApplicationImage"].ToString()));

Are you sure you dont want this instead?:

File.Move(_fileinfo.FullName, _fileinfo.FullName.ToString().Replace(dt.Rows[0]["ApplicationImage"], dt.Rows[0]["ApplicationID"].ToString() + dt.Rows[0]["ApplicationImage"].ToString()));

Or:

File.Move(_fileinfo.FullName, _fileinfo.FullName.Replace(_fileinfo.Name, dt.Rows[0]["ApplicationID"].ToString() + dt.Rows[0]["ApplicationImage"].ToString()));

Answer 2

var defaultPath=@"D:\Projects\LSImage";
var appImage=dt.Rows[0]["ApplicationImage"].ToString();
var appId=dt.Rows[0]["ApplicationID"].ToString();
var srcFile=Path.Combine(defaultPath,appImage);
var dstFile=Path.Combine(defaultPath,appId + appImage);
FileInfo _fileinfo = new FileInfo(srcFile);  // This isn't needed to rename
File.Move(srcFile,dstFile);

Answer 3

FileInfo _fileinfo = new FileInfo(@"D:\Projects\LSImage\" + dt.Rows[0]["ApplicationImage"].ToString());
try
{
    File.Move(_fileinfo.FullName, _fileinfo.FullName.ToString().Replace(_fileinfo.FullName, dt.Rows[0]["ApplicationID"].ToString() + dt.Rows[0]["ApplicationImage"].ToString()));
}
catch(Exception ex)
{
    throw new Exception(String.Format("Trying to rename {0} to {1} failed!",_fileinfo.Fullname,dt.Rows[0]["ApplicationID"].ToString() + dt.Rows[0]["ApplicationImage"].ToString()));
}

Then tell us what it reports.

Answer 4

It looks like you're trying to prepend the ApplicationID onto the front of the file. If so, try this:

FileInfo _fileinfo = new FileInfo(@"D:\Projects\LSImage\" + dt.Rows[0]["ApplicationImage"].ToString());         

string appID = dt.Rows[0]["ApplicationID"].ToString();
string appImage = dt.Rows[0]["ApplicationImage"].ToString();
string newFullPath = @"D:\Projects\LSImage\" + appImage + appID;

File.Move(_fileinfo.FullName, newFullPath); 

Answer 5

File.Move(_fileinfo.FullNmae,_fileinfo.FullName.Replace(_FileInfo.Name,dt.rows[0]["apid"].tostring() + dr.rows[0]["apname"].tosring()))