C#同步、異步長途下載文件實例。本站提示廣大學習愛好者：（C#同步、異步長途下載文件實例）文章只能為提供參考，不一定能成為您想要的結果。以下是C#同步、異步長途下載文件實例正文
1.func Contains(s, substr string) bool這個函數是查找某個字符能否在這個字符串中存在，存在前往true
import (
"fmt"
"strings"
)
func main() {
fmt.Println(strings.Contains("widuu", "wi")) //true
fmt.Println(strings.Contains("wi", "widuu")) //false
}
2.func ContainsAny(s, chars string) bool這個是查詢字符串中能否包括多個字符
import (
"fmt"
"strings"
)
func main() {
fmt.Println(strings.ContainsAny("widuu", "w&d")) //true
}
3.func ContainsRune(s string, r rune) bool,這裡邊固然是字符串中能否包括rune類型，個中rune類型是utf8.RUneCountString可以完全表現全體Unicode字符的類型
import (
"fmt"
"strings"
)
func main() {
fmt.Println(strings.ContainsRune("widuu", rune('w'))) //true
fmt.Println(strings.ContainsRune("widuu", 20)) //fasle
}
4.func Count(s, sep string) int這個的感化就是輸入，在一段字符串中有若干婚配到的字符
import (
"fmt"
"strings"
)
func main() {
fmt.Println(strings.Count("widuu", "uu")) //1
fmt.Println(strings.Count("widuu", "u")) //2
}
5.func Index(s, sep string) int 這個函數是查找字符串，然後前往以後的地位，輸出的都是string類型，然後int的地位信息
import (
"fmt"
"strings"
)
func main() {
fmt.Println(strings.Index("widuu", "i")) //1
fmt.Println(strings.Index("widuu", "u")) //3
}
6.func IndexAny(s, chars string) int 這個函數是一樣的查找，字符串第一次湧現的地位，假如不存在就前往-1
import (
"fmt"
"strings"
)
func main() {
fmt.Println(strings.IndexAny("widuu", "u")) //3
}
7.func IndexByte(s string, c byte) int,這個函數功效照樣查找第一次粗線的地位，只不外此次C是byte類型的，查找到前往地位，找不到前往-1
import (
"fmt"
"strings"
)
func main() {
fmt.Println(strings.IndexByte("hello xiaowei", 'x')) //6
}
8.func IndexRune(s string, r rune) int，照樣查找地位，只不外此次是rune類型的
import (
"fmt"
"strings"
)
func main() {
fmt.Println(strings.IndexRune("widuu", rune('w'))) //0
}
9.func IndexFunc(s string, f func(rune) bool) int這個函數年夜家一看就曉得了，是經由過程類型的轉換來用函數查找地位，我們來代碼看下哈
import (
"fmt"
"strings"
)
func main() {
fmt.Println(strings.IndexFunc("nihaoma", split)) //3
}
func split(r rune) bool {
if r == 'a' {
return true
}
return false
}
10.func LastIndex(s, sep string) int 看到這個年夜家能夠也明確了查找的是最初湧現的地位，正好跟index相反
import (
"fmt"
"strings"
)
func main() {
fmt.Println(strings.LastIndex("widuu", "u")) // 4
}
11.func LastIndexAny(s, chars string) int這個跟indexAny正好相反，也是查找最初一個
import (
"fmt"
"strings"
)
func main() {
fmt.Println(strings.LastIndexAny("widuu", "u")) // 4
}
取得域名 [url]httpwww.sina.com[url]
Match match = Regex.Match(uri, @((http(s)))+[w-.]+[^]);, RegexOptions.IgnoreCase
domainName = match.Value;
取得域名最深層目次 [url]httpwww.sina.commail[url]
if (domainName.Equals(uri))
dnDir = domainName;
else
dnDir = uri.Substring(0, uri.LastIndexOf(''));
dnDir += '';
獲得數據
string pageData = Encoding.UTF8.GetString(e.Result);
Liststring urlList = new Liststring();
婚配全途徑
match = Regex.Match(pageData, @((http(s)))+((()+[w-.]+()))+[w-.]+.+( + ImageType + )); , RegexOptions.IgnoreCase
while (match.Success)
{
string item = match.Value;
短途徑處置
if (item.IndexOf(http) == -1 && item.IndexOf(https) == -1)
item = (item[0] == '' domainName dnDir) + item;
if (!urlList.Contains(item))
{
urlList.Add(item);
imgUrlList.Add(item);
及時顯示剖析成果
AddlbShowItem(item);
邊剖析邊下載
WebRequest hwr = WebRequest.Create(item);
hwr.BeginGetResponse(new AsyncCallback(AsyncDownLoad), hwr);
hwr.Timeout = 0x30D40; 默許 0x186a0 - 100000 0x30D40 - 200000
hwr.Method = POST;
hwr.C;
hwr.MaximumAutomaticRedirections = 3;
hwr.Accept =imagegif, imagex-xbitmap, imagejpeg, imagepjpeg, applicationx-shockwave-flash, applicationvnd.ms-excel, applicationvnd.ms-powerpoint, applicationmsword, ;
hwr.Accept = imagegif, imagex-xbitmap, imagejpeg, imagepjpeg, ;
IAsyncResult iar = hwr.BeginGetResponse(new AsyncCallback(AsyncDownLoad), hwr);
iar.AsyncWaitHandle.WaitOne();
}
match = match.NextMatch();
}
}
}
finally
{
waiter.Set();
#region 剖析計時停止
QueryPerformanceCounter(ref count1);
count = count1 - count;
result = (double)(count) (double)freq;
toolStripStatusLabel1.Text = 剖析終了！;
toolStripStatusLabel2.Text = string.Format( 剖析耗時{0}秒, result);
Application.DoEvents();
#endregion
剖析終了
isAnalyzeComplete = true;
}
}
/// <summary>
/// 異步接收數據
/// </summary>
/// <param name="asyncResult"></param>
public void AsyncDownLoad(IAsyncResult asyncResult)
{
#region 下載計時開端
if (cfreq == 0)
{
QueryPerformanceFrequency(ref cfreq);
QueryPerformanceCounter(ref ccount);
}
#endregion
WebRequest request = (WebRequest)asyncResult.AsyncState;
string url = request.RequestUri.ToString();
try
{
WebResponse response = request.EndGetResponse(asyncResult);
using (Stream stream = response.GetResponseStream())
{
Image img = Image.FromStream(stream);
string[] tmpUrl = url.Split('.');
img.Save(string.Concat(savePath, "/", DateTime.Now.ToString("yyyyMMddHHmmssfff"), ".", tmpUrl[tmpUrl.Length - 1]));
img.Dispose();
stream.Close();
}
allDone.Set();
//從未下載的列表中刪除曾經下載的圖片
imgUrlList.Remove(url);
//更新列表框
int indexItem = this.lbShow.Items.IndexOf(url);
if (indexItem >= 0 && indexItem <= this.lbShow.Items.Count)
SetlbShowItem(indexItem);
}
catch (Exception)
{
imgUrlList.Remove(url);
}
}
