标签：foreach uri .post get请求 .com das str array ref
HTTP作为一个基础功能，有必要介绍下在UWP下的使用方法。
一、Get请求：
一般我们用到的是GetAsync方法
public static async Task Gets(Uri uri) { var response = await httpClient.GetAsync(uri); var str = await response.Content.ReadAsStringAsync(); var stream = await response.Content.ReadAsInputStreamAsync(); var buff = await response.Content.ReadAsBufferAsync(); str = await httpClient.GetStringAsync(uri); stream = await httpClient.GetInputStreamAsync(uri); buff = await httpClient.GetBufferAsync(uri); }
上面方法中的前四行和后三行是等价的。
如果要读取更多的信息，则用GetAsync读取返回值的response。
二、Post请求：
一般来说，我们最常用的是发送一个json串返回也是json串，也就是application/json类型
async public static Task<string> PostStringAsync(string url, string data) { try { HttpClient hc = new HttpClient(); using (var content = new HttpStringContent(data)) { var response = await hc.PostAsync(new Uri(url), content); var resdata = await response.Content.ReadAsStringAsync(); return resdata; } } catch { return null; } }
如果服务器要求的类型是表单类型，也就是x-www-form-urlencoded类型
public async static Task<string> PostFormDataAsync(string url, List<KeyValuePair<string, string>> data) { try { HttpClient hc = new HttpClient(); var content = new HttpFormUrlEncodedContent(data); var response = await hc.PostAsync(new Uri(url), content); var resdata = await response.Content.ReadAsStringAsync(); Debug.WriteLine(resdata); return resdata; } catch { return null; } }
KeyValuePair的构造（注意这里只有string类型和数值类型，不能包含文件类型）：
public List<KeyValuePair<string, string>> CreatFormData<T>(T data) { List<KeyValuePair<string, string>> array = new List<KeyValuePair<string, string>>(); var type = data.GetType(); var propertyInfos = type.GetRuntimeProperties(); foreach (var p in propertyInfos) { if (p.GetValue(data) != null) { array.Add(new KeyValuePair<string, string>(p.Name, p.GetValue(data).ToString())); } } return array; }
如果要传的数据包含文件肿么办？
第一种情况：只有文件 ，application/octet-stream
这种情况比较简单，构造一个HttpStreamContent就可以了：
async public static Task<string> PostSteamAsync(string url, StorageFile file) { try { HttpClient hc = new HttpClient(); using (var content = new HttpStreamContent(await file.OpenAsync(FileAccessMode.Read))) { var response = await hc.PostAsync(new Uri(url), content); var resdata = await response.Content.ReadAsStringAsync(); return resdata; } } catch { return null; } }
第二种情况：既有文件也有数据和字符串。也就是multipart/form-data类型
/// <summary> /// 构造表单数据 /// </summary> /// <param name="data"></param> /// <returns></returns> async private static Task<HttpMultipartFormDataContent> ConstructMuilFromDataAsync(List<FormData> data) { var resdata = new HttpMultipartFormDataContent(boundary); foreach (var item in data) { if (item.File == null && !string.IsNullOrEmpty(item.Value)) { var scontent = new HttpStringContent(item.Value); scontent.Headers.ContentDisposition = new HttpContentDispositionHeaderValue("form-data"); resdata.Add(scontent, item.Name); } else if (item.File != null) { var stream = await item.File.OpenAsync(FileAccessMode.Read); var buffcontent = new HttpStreamContent(stream); buffcontent.Headers.ContentDisposition = new HttpContentDispositionHeaderValue("form-data"); buffcontent.Headers.ContentType = HttpMediaTypeHeaderValue.Parse(item.ContentType); resdata.Add(buffcontent, item.Name, item.FileName); } } return resdata; } /// <summary> /// 发送复杂表单类型 /// </summary> /// <param name="url"></param> /// <param name="data"></param> /// <returns></returns> async public static Task<string> PostMuilFormDataAsync(string url, List<FormData> data) { try { HttpClient hc = new HttpClient(); var content = await ConstructMuilFromDataAsync(data); var response = await hc.PostAsync(new Uri(url), content); var resdata = await response.Content.ReadAsStringAsync(); Debug.WriteLine(resdata); return resdata; } catch { return null; } } ///自定义FormData类 public class FormData { private string _name; private string _value; private string _type; public string Name { get { return _name; } set { _name = value; } } public string Value { get { return _value; } set { _value = value; } } public string ContentType { get { return _type; } set { _type = value; } } public StorageFile File { get; set; } public string FileName { get; set; } }
关于这段的FormData是我自己构造的，如果你有更好的方法，请告诉我。其中ContenType：Image为”Image/jpeg“;MP3为”Audio/MP3“；MP4为”Video/MP4“关于其他的则可以自行在网络上查询。
好了，关于Http的介绍就到这里了，如果还有其他的问题，欢迎留言或者联系我
标签：foreach uri .post get请求 .com das str array ref
原文地址：http://www.cnblogs.com/Yixin-ran/p/6069029.html
