如果我想使用System.Net.HttpClient提交一个http获取请求,似乎没有api来添加参数,这是正确的吗?
是否有任何简单的api可用来构建查询字符串,不涉及构建名称值集合和url编码,然后最后连接它们? 我希望使用类似RestSharp的api(即AddParameter(..))
如果我想使用System.Net.HttpClient提交一个http获取请求,似乎没有api来添加参数,这是正确的吗?
是否有任何简单的api可用来构建查询字符串,不涉及构建名称值集合和url编码,然后最后连接它们? 我希望使用类似RestSharp的api(即AddParameter(..))
当前回答
在一个ASP。在asp.net Core项目中,你可以使用QueryHelpers类,在Microsoft.AspNetCore.WebUtilities命名空间中。NET Core,或。NET标准2.0 NuGet包给其他消费者:
// using Microsoft.AspNetCore.WebUtilities;
var query = new Dictionary<string, string>
{
["foo"] = "bar",
["foo2"] = "bar2",
// ...
};
var response = await client.GetAsync(QueryHelpers.AddQueryString("/api/", query));
其他回答
我找不到比创建一个扩展方法来将Dictionary转换为QueryStringFormat更好的解决方案。Waleed A.K.提出的解决方案也不错。
遵循我的解决方案:
创建扩展方法:
public static class DictionaryExt
{
public static string ToQueryString<TKey, TValue>(this Dictionary<TKey, TValue> dictionary)
{
return ToQueryString<TKey, TValue>(dictionary, "?");
}
public static string ToQueryString<TKey, TValue>(this Dictionary<TKey, TValue> dictionary, string startupDelimiter)
{
string result = string.Empty;
foreach (var item in dictionary)
{
if (string.IsNullOrEmpty(result))
result += startupDelimiter; // "?";
else
result += "&";
result += string.Format("{0}={1}", item.Key, item.Value);
}
return result;
}
}
和他们:
var param = new Dictionary<string, string>
{
{ "param1", "value1" },
{ "param2", "value2" },
};
param.ToQueryString(); //By default will add (?) question mark at begining
//"?param1=value1¶m2=value2"
param.ToQueryString("&"); //Will add (&)
//"¶m1=value1¶m2=value2"
param.ToQueryString(""); //Won't add anything
//"param1=value1¶m2=value2"
由于我必须重用这几次,所以我提出了这个类,它只是帮助抽象查询字符串是如何组成的。
public class UriBuilderExt
{
private NameValueCollection collection;
private UriBuilder builder;
public UriBuilderExt(string uri)
{
builder = new UriBuilder(uri);
collection = System.Web.HttpUtility.ParseQueryString(string.Empty);
}
public void AddParameter(string key, string value) {
collection.Add(key, value);
}
public Uri Uri{
get
{
builder.Query = collection.ToString();
return builder.Uri;
}
}
}
使用将被简化成这样:
var builder = new UriBuilderExt("http://example.com/");
builder.AddParameter("foo", "bar<>&-baz");
builder.AddParameter("bar", "second");
var uri = builder.Uri;
将返回uri: http://example.com/?foo=bar%3c%3e%26-baz&bar=second
如果我想使用System.Net.HttpClient提交一个http get请求 似乎没有API来添加参数,这是正确的吗?
Yes.
是否有任何简单的api可用来构建查询字符串 不涉及构建名称值集合和url编码 然后最后把它们连接起来?
肯定的:
var query = HttpUtility.ParseQueryString(string.Empty);
query["foo"] = "bar<>&-baz";
query["bar"] = "bazinga";
string queryString = query.ToString();
会给你预期的结果:
foo=bar%3c%3e%26-baz&bar=bazinga
你可能还会发现UriBuilder类很有用:
var builder = new UriBuilder("http://example.com");
builder.Port = -1;
var query = HttpUtility.ParseQueryString(builder.Query);
query["foo"] = "bar<>&-baz";
query["bar"] = "bazinga";
builder.Query = query.ToString();
string url = builder.ToString();
会给你预期的结果:
http://example.com/?foo=bar%3c%3e%26-baz&bar=bazinga
你可以非常安全地将它提供给HttpClient。GetAsync方法。
感谢“Darin Dimitrov”,这是扩展方法。
public static partial class Ext
{
public static Uri GetUriWithparameters(this Uri uri,Dictionary<string,string> queryParams = null,int port = -1)
{
var builder = new UriBuilder(uri);
builder.Port = port;
if(null != queryParams && 0 < queryParams.Count)
{
var query = HttpUtility.ParseQueryString(builder.Query);
foreach(var item in queryParams)
{
query[item.Key] = item.Value;
}
builder.Query = query.ToString();
}
return builder.Uri;
}
public static string GetUriWithparameters(string uri,Dictionary<string,string> queryParams = null,int port = -1)
{
var builder = new UriBuilder(uri);
builder.Port = port;
if(null != queryParams && 0 < queryParams.Count)
{
var query = HttpUtility.ParseQueryString(builder.Query);
foreach(var item in queryParams)
{
query[item.Key] = item.Value;
}
builder.Query = query.ToString();
}
return builder.Uri.ToString();
}
}
与罗斯托夫的帖子一样,如果你不想包含对系统的引用。在你的项目中,你可以使用System.Net.Http.Formatting中的FormDataCollection,然后做如下的事情:
使用System.Net.Http.Formatting.FormDataCollection
var parameters = new Dictionary<string, string>()
{
{ "ham", "Glaced?" },
{ "x-men", "Wolverine + Logan" },
{ "Time", DateTime.UtcNow.ToString() },
};
var query = new FormDataCollection(parameters).ReadAsNameValueCollection().ToString();