当在c#中构建Windows控制台应用程序时，是否有可能写入控制台而不必扩展当前行或去到新行?例如，如果我想显示一个百分比，表示一个流程离完成有多近，我只需要在游标所在的同一行上更新该值，而不必将每个百分比放在新行上。
这可以用“标准”c#控制台应用程序来实现吗?
当前回答
SetCursorPosition方法适用于多线程场景，而其他两个方法则不能
其他回答
如果你想让生成的文件看起来很酷，这是可行的。
int num = 1;
var spin = new ConsoleSpinner();
Console.ForegroundColor = ConsoleColor.Green;
Console.Write("");
while (true)
{
spin.Turn();
Console.Write("\r{0} Generating Files ", num);
num++;
}
这是我从下面的一些答案得到的方法，并修改了它
public class ConsoleSpinner
{
int counter;
public void Turn()
{
counter++;
switch (counter % 4)
{
case 0: Console.Write("."); counter = 0; break;
case 1: Console.Write(".."); break;
case 2: Console.Write("..."); break;
case 3: Console.Write("...."); break;
case 4: Console.Write("\r"); break;
}
Thread.Sleep(100);
Console.SetCursorPosition(23, Console.CursorTop);
}
}
以下是我对s soosh和0xA3的回答的看法。 它可以在更新旋转器的同时用用户消息更新控制台，并且还有一个运行时间指示器。
public class ConsoleSpiner : IDisposable
{
private static readonly string INDICATOR = "/-\\|";
private static readonly string MASK = "\r{0} {1:c} {2}";
int counter;
Timer timer;
string message;
public ConsoleSpiner() {
counter = 0;
timer = new Timer(200);
timer.Elapsed += TimerTick;
}
public void Start() {
timer.Start();
}
public void Stop() {
timer.Stop();
counter = 0;
}
public string Message {
get { return message; }
set { message = value; }
}
private void TimerTick(object sender, ElapsedEventArgs e) {
Turn();
}
private void Turn() {
counter++;
var elapsed = TimeSpan.FromMilliseconds(counter * 200);
Console.Write(MASK, INDICATOR[counter % 4], elapsed, this.Message);
}
public void Dispose() {
Stop();
timer.Elapsed -= TimerTick;
this.timer.Dispose();
}
}
用法是这样的:
class Program
{
static void Main(string[] args)
{
using (var spinner = new ConsoleSpiner())
{
spinner.Start();
spinner.Message = "About to do some heavy staff :-)"
DoWork();
spinner.Message = "Now processing other staff".
OtherWork();
spinner.Stop();
}
Console.WriteLine("COMPLETED!!!!!\nPress any key to exit.");
}
}
public void Update(string data)
{
Console.Write(string.Format("\r{0}", "".PadLeft(Console.CursorLeft, ' ')));
Console.Write(string.Format("\r{0}", data));
}
我只需要使用divo的ConsoleSpinner类。我的远没有那么简洁，但我不喜欢这个类的用户必须编写自己的while(true)循环。我追求的是这样的经历:
static void Main(string[] args)
{
Console.Write("Working....");
ConsoleSpinner spin = new ConsoleSpinner();
spin.Start();
// Do some work...
spin.Stop();
}
我用下面的代码实现了它。由于我不希望Start()方法阻塞，我不希望用户不得不担心编写while(spinFlag)类循环，并且我希望同时允许多个旋转器，因此我必须生成一个单独的线程来处理旋转。这意味着代码要复杂得多。
此外，我没有做那么多多线程，所以有可能(甚至可能)我在那里留下了一个或三个微妙的错误。但到目前为止，它似乎运行得很好:
public class ConsoleSpinner : IDisposable
{
public ConsoleSpinner()
{
CursorLeft = Console.CursorLeft;
CursorTop = Console.CursorTop;
}
public ConsoleSpinner(bool start)
: this()
{
if (start) Start();
}
public void Start()
{
// prevent two conflicting Start() calls ot the same instance
lock (instanceLocker)
{
if (!running )
{
running = true;
turner = new Thread(Turn);
turner.Start();
}
}
}
public void StartHere()
{
SetPosition();
Start();
}
public void Stop()
{
lock (instanceLocker)
{
if (!running) return;
running = false;
if (! turner.Join(250))
turner.Abort();
}
}
public void SetPosition()
{
SetPosition(Console.CursorLeft, Console.CursorTop);
}
public void SetPosition(int left, int top)
{
bool wasRunning;
//prevent other start/stops during move
lock (instanceLocker)
{
wasRunning = running;
Stop();
CursorLeft = left;
CursorTop = top;
if (wasRunning) Start();
}
}
public bool IsSpinning { get { return running;} }
/* --- PRIVATE --- */
private int counter=-1;
private Thread turner;
private bool running = false;
private int rate = 100;
private int CursorLeft;
private int CursorTop;
private Object instanceLocker = new Object();
private static Object console = new Object();
private void Turn()
{
while (running)
{
counter++;
// prevent two instances from overlapping cursor position updates
// weird things can still happen if the main ui thread moves the cursor during an update and context switch
lock (console)
{
int OldLeft = Console.CursorLeft;
int OldTop = Console.CursorTop;
Console.SetCursorPosition(CursorLeft, CursorTop);
switch (counter)
{
case 0: Console.Write("/"); break;
case 1: Console.Write("-"); break;
case 2: Console.Write("\\"); break;
case 3: Console.Write("|"); counter = -1; break;
}
Console.SetCursorPosition(OldLeft, OldTop);
}
Thread.Sleep(rate);
}
lock (console)
{ // clean up
int OldLeft = Console.CursorLeft;
int OldTop = Console.CursorTop;
Console.SetCursorPosition(CursorLeft, CursorTop);
Console.Write(' ');
Console.SetCursorPosition(OldLeft, OldTop);
}
}
public void Dispose()
{
Stop();
}
}
如果要更新一行，但信息太长而不能在一行上显示，则可能需要一些新行。我遇到过这个问题，下面是解决这个问题的一种方法。
public class DumpOutPutInforInSameLine
{
//content show in how many lines
int TotalLine = 0;
//start cursor line
int cursorTop = 0;
// use to set character number show in one line
int OneLineCharNum = 75;
public void DumpInformation(string content)
{
OutPutInSameLine(content);
SetBackSpace();
}
static void backspace(int n)
{
for (var i = 0; i < n; ++i)
Console.Write("\b \b");
}
public void SetBackSpace()
{
if (TotalLine == 0)
{
backspace(OneLineCharNum);
}
else
{
TotalLine--;
while (TotalLine >= 0)
{
backspace(OneLineCharNum);
TotalLine--;
if (TotalLine >= 0)
{
Console.SetCursorPosition(OneLineCharNum, cursorTop + TotalLine);
}
}
}
}
private void OutPutInSameLine(string content)
{
//Console.WriteLine(TotalNum);
cursorTop = Console.CursorTop;
TotalLine = content.Length / OneLineCharNum;
if (content.Length % OneLineCharNum > 0)
{
TotalLine++;
}
if (TotalLine == 0)
{
Console.Write("{0}", content);
return;
}
int i = 0;
while (i < TotalLine)
{
int cNum = i * OneLineCharNum;
if (i < TotalLine - 1)
{
Console.WriteLine("{0}", content.Substring(cNum, OneLineCharNum));
}
else
{
Console.Write("{0}", content.Substring(cNum, content.Length - cNum));
}
i++;
}
}
}
class Program
{
static void Main(string[] args)
{
DumpOutPutInforInSameLine outPutInSameLine = new DumpOutPutInforInSameLine();
outPutInSameLine.DumpInformation("");
outPutInSameLine.DumpInformation("bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb");
outPutInSameLine.DumpInformation("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
outPutInSameLine.DumpInformation("bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb");
//need several lines
outPutInSameLine.DumpInformation("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
outPutInSameLine.DumpInformation("bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb");
outPutInSameLine.DumpInformation("aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");
outPutInSameLine.DumpInformation("bbbbbbbbbbbbbbbbbbbbbbbbbbb");
}
}
