/// <summary>
/// 指定精度的求导
/// </summary>
/// <param name="f"></param>
/// <param name="x"></param>
/// <param name="Precision"></param>
/// <returns></returns>
static public double DerivativeByPrecision(Func11 f, double x, double Precision)
{
double h = 0.125, d, dd, u;
if (f(x) == double.NaN)
{
return(double.NaN); //是否在定义域内，若不在定义域内，则返回NaN
}
d = (f(x + h) - f(x)) / h;
while (h > 0.000000000001)
{
h /= 2;
dd = (f(x + h) - f(x)) / h;
u = dd - d;
if (u < 0)
{
u = -u;
}
if (u < Precision)
{
return(dd);
}
d = dd;
}
return(double.NaN);
}
/// <summary>
/// 求f的导函数
/// </summary>
/// <param name="f"></param>
/// <returns></returns>
static public Func11 DerivativeAuto(Func11 f)
{
return(delegate(double x) { return DerivativeAuto(f, x); });
}
/// <summary>
/// 指定步长的求导，不会判断导函数是否存在
/// </summary>
/// <param name="f">一元数量函数f</param>
/// <param name="x">求x处的导</param>
/// <param name="Step">求导步长</param>
/// <returns></returns>
static public double DerivativeByStep(Func11 f, double x, double Step)
{
return((f(x + Step) - f(x)) / Step);
}
public void DownloadFile(Func21 onDataRead,Func01 onComplete,Func11 onError)
{
try
{
string methodLine = string.Format("GET {0} HTTP/1.1", this.UrlAddress.FilePath);
string hostLine = string.Format("Host: {0}", this.UrlAddress.Host);
string connectionLine = "Connection: Close";
var requestArray = new string[]
{
methodLine,
hostLine,
connectionLine,
"",
"",
};
var socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, System.Net.Sockets.ProtocolType.Tcp);
socket.Connect(this.UrlAddress.Host, this.UrlAddress.Port);
var request = string.Join("\r\n", requestArray);
var requestB = Encoding.Default.GetBytes(request);
socket.Send(requestB);
int readBytes = 0;
byte[] buffer = new byte[1024];
readBytes = socket.Receive(buffer);
if (onDataRead != null)
{
onDataRead(buffer, readBytes);
}
while (readBytes > 0)
{
if (onDataRead != null)
{
onDataRead(buffer, readBytes);
}
readBytes = socket.Receive(buffer);
}
socket.Close();
if (onComplete != null)
{
onComplete();
}
}
catch (Exception ex)
{
if (onError != null)
{
onError(ex);
}
}
}