C# 正确使用string.format在WinC窗体中显示字符串#

我有一个窗口窗体，在该窗体中显示listview中的所有目录。对于复制文件，如果一个文件已经存在，它将再次复制该文件，并将file.txt（1）添加到该文件中。如果再次复制该文件，则将file.txt（2）

string fileNameOnly = Path.GetFileNameWithoutExtension(file);
string extension = Path.GetExtension(file);
string pathDir = Path.GetDirectoryName(file);
string tempFileName = string.Format("{0}({1})", fileNameOnly, count++);
string newfileName = Path.Combine(pathDir, tempFileName + extension);

if (MessageBox.Show(file + "is already exists\r\nDo you want to copy Again?",
                    "Overwrite", MessageBoxButtons.OKCancel,
                    MessageBoxIcon.Asterisk) == DialogResult.OK)
{
    //  Directory.Move(file, Path.Combine(new string[] { DestinationFolder, newfileName }));
    File.Copy(file, Path.Combine(new string[] { DestinationFolder, newfileName }));
    MessageBox.Show("File Copied");

---

但问题是，当我一次又一次地复制这些文件时，模式就像file.txt（1）/file.txt（1）（1）/file.txt（1）（1）/file.txt（1）（1）/里面的数字不会增加。我不知道每次复制时如何增加计数。有人能告诉我做错了什么吗

string fileNameOnly = Path.GetFileNameWithoutExtension(file);
string extension = Path.GetExtension(file);
string pathDir = Path.GetDirectoryName(file);
string tempFileName = string.Format("{0}({1})", fileNameOnly, count++);
string newfileName = Path.Combine(pathDir, tempFileName + extension);

if (MessageBox.Show(file + "is already exists\r\nDo you want to copy Again?",
                    "Overwrite", MessageBoxButtons.OKCancel,
                    MessageBoxIcon.Asterisk) == DialogResult.OK)
{
    //  Directory.Move(file, Path.Combine(new string[] { DestinationFolder, newfileName }));
    File.Copy(file, Path.Combine(new string[] { DestinationFolder, newfileName }));
    MessageBox.Show("File Copied");

string tempFileName = string.Format("{0}({1})", fileNameOnly, count++);

---

{}内的任何内容都是占位符。您使用了{（1）}，它将始终为1。

code>count++表示变量在求值后递增。您可能希望这样：

string fileNameOnly = Path.GetFileNameWithoutExtension(file);
string extension = Path.GetExtension(file);
string pathDir = Path.GetDirectoryName(file);
string tempFileName = string.Format("{0}({1})", fileNameOnly, count++);
string newfileName = Path.Combine(pathDir, tempFileName + extension);

if (MessageBox.Show(file + "is already exists\r\nDo you want to copy Again?",
                    "Overwrite", MessageBoxButtons.OKCancel,
                    MessageBoxIcon.Asterisk) == DialogResult.OK)
{
    //  Directory.Move(file, Path.Combine(new string[] { DestinationFolder, newfileName }));
    File.Copy(file, Path.Combine(new string[] { DestinationFolder, newfileName }));
    MessageBox.Show("File Copied");

string tempFileName = string.Format("{0}({1})", fileNameOnly, ++count);

int count = 0;
string fullPath = file;
while (File.Exists(fullPath))
{
    string fileName = Path.GetFileName(file);
    string extension = Path.GetExtension(fileName);
    string fileNameWithoutExtension = Path.GetFileNameWithoutExtension(fileName);
    int lastIndexOfOpenBracket = fileNameWithoutExtension.LastIndexOf('(');
    string fileNameWithoutNumber = fileNameWithoutExtension.Substring(0, lastIndexOfOpenBracket);
    fileNameWithoutExtension = string.Format("{0}({1})", fileNameWithoutNumber, ++count);
    fullPath = Path.Combine(DestinationFolder, fileNameWithoutExtension + extension);
}
if (MessageBox.Show(file + " already exists\r\nDo you want to copy Again?",
        "Overwrite", MessageBoxButtons.OKCancel,
        MessageBoxIcon.Asterisk) == DialogResult.OK)
{
    File.Copy(file, fullPath);
    MessageBox.Show("File Copied");
}

（请注意，我还将括号移到了括号外）

string fileNameOnly = Path.GetFileNameWithoutExtension(file);
string extension = Path.GetExtension(file);
string pathDir = Path.GetDirectoryName(file);
string tempFileName = string.Format("{0}({1})", fileNameOnly, count++);
string newfileName = Path.Combine(pathDir, tempFileName + extension);

if (MessageBox.Show(file + "is already exists\r\nDo you want to copy Again?",
                    "Overwrite", MessageBoxButtons.OKCancel,
                    MessageBoxIcon.Asterisk) == DialogResult.OK)
{
    //  Directory.Move(file, Path.Combine(new string[] { DestinationFolder, newfileName }));
    File.Copy(file, Path.Combine(new string[] { DestinationFolder, newfileName }));
    MessageBox.Show("File Copied");

编辑：

string fileNameOnly = Path.GetFileNameWithoutExtension(file);
string extension = Path.GetExtension(file);
string pathDir = Path.GetDirectoryName(file);
string tempFileName = string.Format("{0}({1})", fileNameOnly, count++);
string newfileName = Path.Combine(pathDir, tempFileName + extension);

if (MessageBox.Show(file + "is already exists\r\nDo you want to copy Again?",
                    "Overwrite", MessageBoxButtons.OKCancel,
                    MessageBoxIcon.Asterisk) == DialogResult.OK)
{
    //  Directory.Move(file, Path.Combine(new string[] { DestinationFolder, newfileName }));
    File.Copy(file, Path.Combine(new string[] { DestinationFolder, newfileName }));
    MessageBox.Show("File Copied");

另外，您总是使用完整的文件名（不带扩展名）来创建新文件。但是您应该用旧的数字+1替换旧的数字

string fileNameOnly = Path.GetFileNameWithoutExtension(file);
string extension = Path.GetExtension(file);
string pathDir = Path.GetDirectoryName(file);
string tempFileName = string.Format("{0}({1})", fileNameOnly, count++);
string newfileName = Path.Combine(pathDir, tempFileName + extension);

if (MessageBox.Show(file + "is already exists\r\nDo you want to copy Again?",
                    "Overwrite", MessageBoxButtons.OKCancel,
                    MessageBoxIcon.Asterisk) == DialogResult.OK)
{
    //  Directory.Move(file, Path.Combine(new string[] { DestinationFolder, newfileName }));
    File.Copy(file, Path.Combine(new string[] { DestinationFolder, newfileName }));
    MessageBox.Show("File Copied");

请尝试以下方法：

string fileNameOnly = Path.GetFileNameWithoutExtension(file);
string extension = Path.GetExtension(file);
string pathDir = Path.GetDirectoryName(file);
string tempFileName = string.Format("{0}({1})", fileNameOnly, count++);
string newfileName = Path.Combine(pathDir, tempFileName + extension);

if (MessageBox.Show(file + "is already exists\r\nDo you want to copy Again?",
                    "Overwrite", MessageBoxButtons.OKCancel,
                    MessageBoxIcon.Asterisk) == DialogResult.OK)
{
    //  Directory.Move(file, Path.Combine(new string[] { DestinationFolder, newfileName }));
    File.Copy(file, Path.Combine(new string[] { DestinationFolder, newfileName }));
    MessageBox.Show("File Copied");

string tempFileName = string.Format("{0}({1})", fileNameOnly, ++count);

int count = 0;
string fullPath = file;
while (File.Exists(fullPath))
{
    string fileName = Path.GetFileName(file);
    string extension = Path.GetExtension(fileName);
    string fileNameWithoutExtension = Path.GetFileNameWithoutExtension(fileName);
    int lastIndexOfOpenBracket = fileNameWithoutExtension.LastIndexOf('(');
    string fileNameWithoutNumber = fileNameWithoutExtension.Substring(0, lastIndexOfOpenBracket);
    fileNameWithoutExtension = string.Format("{0}({1})", fileNameWithoutNumber, ++count);
    fullPath = Path.Combine(DestinationFolder, fileNameWithoutExtension + extension);
}
if (MessageBox.Show(file + " already exists\r\nDo you want to copy Again?",
        "Overwrite", MessageBoxButtons.OKCancel,
        MessageBoxIcon.Asterisk) == DialogResult.OK)
{
    File.Copy(file, fullPath);
    MessageBox.Show("File Copied");
}

---

你犯了一个简单的错误

string fileNameOnly = Path.GetFileNameWithoutExtension(file);
string extension = Path.GetExtension(file);
string pathDir = Path.GetDirectoryName(file);
string tempFileName = string.Format("{0}({1})", fileNameOnly, count++);
string newfileName = Path.Combine(pathDir, tempFileName + extension);

if (MessageBox.Show(file + "is already exists\r\nDo you want to copy Again?",
                    "Overwrite", MessageBoxButtons.OKCancel,
                    MessageBoxIcon.Asterisk) == DialogResult.OK)
{
    //  Directory.Move(file, Path.Combine(new string[] { DestinationFolder, newfileName }));
    File.Copy(file, Path.Combine(new string[] { DestinationFolder, newfileName }));
    MessageBox.Show("File Copied");

string tempFileName = string.Format("{0}({1})", fileNameOnly, count++);

---

将{（1）}替换为（{1}）

这次我已经修改了你的代码格式，但以后请在发布之前整理好你的问题…（该死…Jon Skeet只比我的编辑快了一秒钟。他甚至编辑得很快！）你确定{（1）}总是1吗？它会显示file.txt（1）（2）（2）当我第三次复制它时time@engineer41：你真的使用了完整的代码吗？我改变了一切<代码>文件是文件的完整路径吗？@engineer41:重试。我忘了用新零件替换旧零件。看看

lastIndexOfOpenBracket

part.ys，但我们仍然没有检查条件，如果（conatain 1在下一个索引处，然后将其增加到2，就像它的2将其增加到3一样。我们增加的是（1）…n在第二次编辑后，它会这样做…f.txt（1）…f.txt（1）（2）…f.txt（1）（1）（2）让我们

string fileNameOnly = Path.GetFileNameWithoutExtension(file);
string extension = Path.GetExtension(file);
string pathDir = Path.GetDirectoryName(file);
string tempFileName = string.Format("{0}({1})", fileNameOnly, count++);
string newfileName = Path.Combine(pathDir, tempFileName + extension);

if (MessageBox.Show(file + "is already exists\r\nDo you want to copy Again?",
                    "Overwrite", MessageBoxButtons.OKCancel,
                    MessageBoxIcon.Asterisk) == DialogResult.OK)
{
    //  Directory.Move(file, Path.Combine(new string[] { DestinationFolder, newfileName }));
    File.Copy(file, Path.Combine(new string[] { DestinationFolder, newfileName }));
    MessageBox.Show("File Copied");