entityMap|blocks|key|b1pmb|text|您只需调用服务器并解析响应即可。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|78doc|var+uri+=+String.Format("https://blockchain.info/tobtc?currency=USD&value={0}",+500);

WebClient+client+=+new+WebClient();
client.UseDefaultCredentials+=+true;
var+data+=+client.DownloadString(uri);

var+result+=+Convert.ToDouble(data);|code-block|syntax|javascript|e71m1^0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|I|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|J|9|@]|A|@]|B|$F|G]]|$2|H|4|-4|6|7|8|K|9|@]|A|@]|B|$]]]]

You need to just make call to server and parse the response.

<pre><code>var uri = String.Format("https://blockchain.info/tobtc?currency=USD&amp;value={0}", 500);

WebClient client = new WebClient();
client.UseDefaultCredentials = true;
var data = client.DownloadString(uri);

var result = Convert.ToDouble(data);
</code></pre>

entityMap|blocks|key|bf5d1|text|Install-Package+CoinMarketCapClient|type|unstyled|depth|inlineStyleRanges|entityRanges|data|87sov|使用CoinMarketCap；|2k35t|public+static+async+Task<double>+GetBitcoinInUsd(double+usd){
++++++++++++//https://api.coinmarketcap.com/v1/ticker/bitcoin/
++++++++++++CoinMarketCapClient+client+=+CoinMarketCapClient.GetInstance();
++++++++++++var+entity+=+await+client.GetTickerAsync("bitcoin");
++++++++++++return+entity.PriceUsd+*+usd;
}|code-block|syntax|javascript|9uncp^0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|K|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|L|9|@]|A|@]|B|$]]|$2|E|4|F|6|G|8|M|9|@]|A|@]|B|$H|I]]|$2|J|4|-4|6|7|8|N|9|@]|A|@]|B|$]]]]

Install-Package CoinMarketCapClient

using CoinMarketCap;

<pre><code>public static async Task&lt;double&gt; GetBitcoinInUsd(double usd){
 //https://api.coinmarketcap.com/v1/ticker/bitcoin/
 CoinMarketCapClient client = CoinMarketCapClient.GetInstance();
 var entity = await client.GetTickerAsync("bitcoin");
 return entity.PriceUsd * usd;
}
</code></pre>

entityMap|0|type|LINK|mutability|MUTABLE|data|url|https://blockchain.info/tobtc?currency=USD&value=|blocks|key|b5sj6|text|var+uri+=+String.Format(@"https://blockchain.info/tobtc?currency=USD&value={0}",1)；|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|dq5sn|新客户端=+WebClient+WebClient()；|97ocu|client.UseDefaultCredentials+=+true；|4n8fl|var+data+=+client.DownloadString(uri)；|7l8hp|var+result+=1/Convert.ToDouble(data.Replace(‘.，'，'))；//收到1btc=+result；|2si31^0|Q|1D|0|0|0|0|0|0^^$0|$1|$2|3|4|5|6|$7|8]]]|9|@$A|B|C|D|2|E|F|T|G|@]|H|@$I|U|J|V|A|W]]|6|$]]|$A|K|C|L|2|E|F|X|G|@]|H|@]|6|$]]|$A|M|C|N|2|E|F|Y|G|@]|H|@]|6|$]]|$A|O|C|P|2|E|F|Z|G|@]|H|@]|6|$]]|$A|Q|C|R|2|E|F|10|G|@]|H|@]|6|$]]|$A|S|C|-4|2|E|F|11|G|@]|H|@]|6|$]]]]

var uri = String.Format(@"<a href="https://blockchain.info/tobtc?currency=USD&amp;value=" rel="nofollow noreferrer">https://blockchain.info/tobtc?currency=USD&amp;value=</a>{0}",1);

WebClient client = new WebClient();

client.UseDefaultCredentials = true;

var data = client.DownloadString(uri);

var result = 1/Convert.ToDouble(data.Replace('.',',')); //you will receive 1 btc = result;

entityMap|0|type|LINK|mutability|MUTABLE|data|url|https://github.com/MelbourneDeveloper/CryptoCurrency.Net/blob/master/src/CryptoCurrency.Net/APIClients/PriceEstimationClients/CryptoCompareClient.cs|1|https://github.com/MelbourneDeveloper/CryptoCurrency.Net/blob/master/src/CryptoCurrency.Net/APIClients/PriceEstimationClients/PriceEstimationManager.cs|2|https://github.com/MelbourneDeveloper/CryptoCurrency.Net/blob/master/src/CryptoCurrency.Net.UnitTests/PricingTests.cs|blocks|key|46a1m|text|有几个API可以让你请求一系列加密货币和/或法定货币的价格。问题是所有的API都是以一种完全不同的方式来做这件事的。随之而来的是，任何人都可能在任何给定的时间宕机，所以你需要有一些内置的容错能力。也就是说，代码应该尝试使用一个API，如果失败了，就转到下一个API。当然，由于价格是主观的，并且局限于给定的国家、交易所等，这一事实进一步复杂化了。因此，获得一个准确的值是非常困难的。|unstyled|depth|inlineStyleRanges|entityRanges|5febt|以下是比较来自CryptoCurrency.Net+(https://github.com/MelbourneDeveloper/CryptoCurrency.Net/blob/master/src/CryptoCurrency.Net/APIClients/PriceEstimationClients/CryptoCompareClient.cs)的客户端的示例加密：|offset|length|1u558|public+class+CryptoCompareClient+:+PriceEstimationClientBase,+IPriceEstimationClient
++++{
++++++++public+CryptoCompareClient(IRestClientFactory+restClientFactory)+:+base(restClientFactory)
++++++++{
++++++++++++RESTClient+=+restClientFactory.CreateRESTClient(new+Uri("https://min-api.cryptocompare.com"));
++++++++}

++++++++protected+override+Func<GetPricesArgs,+Task<EstimatedPricesModel>>+GetPricesFunc+{+get;+}+=+async+a+=>
++++++++{
++++++++++++var+retVal+=+new+EstimatedPricesModel();

++++++++++++if+(a.Currencies.ToList().Count+==+0)
++++++++++++{
++++++++++++++++return+retVal;
++++++++++++}

++++++++++++retVal.LastUpdate+=+DateTime.Now;

++++++++++++var+symbolsPart+=+string.Join(",",+a.Currencies.Select(c+=>+c.Name));

++++++++++++var+priceJson+=+await+a.RESTClient.GetAsync<string>($"data/pricemultifull?fsyms={symbolsPart}&tsyms={a.FiatCurrency}");

++++++++++++var+jObject+=+(JObject)JsonConvert.DeserializeObject(priceJson);

++++++++++++var+rawNode+=+(JObject)jObject.First.First;

++++++++++++foreach+(JProperty+coinNode+in+rawNode.Children())
++++++++++++{
++++++++++++++++var+fiatNode+=+(JProperty)coinNode.First().First;

++++++++++++++++var+allProperties+=+fiatNode.First.Children().Cast<JProperty>().ToList();

++++++++++++++++var+change24HourProperty+=+allProperties.FirstOrDefault(p+=>+string.Compare(p.Name,+"CHANGEPCT24HOUR",+true)+==+0);
++++++++++++++++var+priceProperty+=+allProperties.FirstOrDefault(p+=>+string.Compare(p.Name,+"PRICE",+true)+==+0);

++++++++++++++++var+price+=+(decimal)priceProperty.Value;
++++++++++++++++var+change24Hour+=+(decimal)change24HourProperty.Value;
++++++++++++++++retVal.Result.Add(new+CoinEstimate+{+CurrencySymbol+=+new+CurrencySymbol(coinNode.Name),+ChangePercentage24Hour+=+change24Hour,+FiatEstimate+=+price,+LastUpdate+=+DateTime.Now+});
++++++++++++}

++++++++++++//Extreme+hack.+It's+better+to+show+zero+than+nothing+at+all+and+get+the+coins+stuck
++++++++++++foreach+(var+currency+in+a.Currencies)
++++++++++++{
++++++++++++++++if+(retVal.Result.FirstOrDefault(ce+=>+ce.CurrencySymbol.Equals(currency))+==+null)
++++++++++++++++{
++++++++++++++++++++retVal.Result.Add(new+CoinEstimate+{+ChangePercentage24Hour+=+0,+CurrencySymbol+=+currency,+FiatEstimate+=+0,+LastUpdate+=+DateTime.Now+});
++++++++++++++++}
++++++++++++}

++++++++++++return+retVal;
++++++++};
}|code-block|syntax|javascript|ems8o|PriceEstimationManager将快速浏览API，直到找到一个可以工作的API+(https://github.com/MelbourneDeveloper/CryptoCurrency.Net/blob/master/src/CryptoCurrency.Net/APIClients/PriceEstimationClients/PriceEstimationManager.cs)：|bfdln|public+class+PriceEstimationManager
{
++++#region+Fields
++++private+readonly+Collection<IPriceEstimationClient>+_Clients+=+new+Collection<IPriceEstimationClient>();
++++#endregion

++++#region+Constructor
++++public+PriceEstimationManager(IRestClientFactory+restClientFactory)
++++{
++++++++foreach+(var+typeInfo+in+typeof(PriceEstimationManager).GetTypeInfo().Assembly.DefinedTypes)
++++++++{
++++++++++++var+type+=+typeInfo.AsType();

++++++++++++if+(typeInfo.ImplementedInterfaces.Contains(typeof(IPriceEstimationClient)))
++++++++++++{
++++++++++++++++_Clients.Add((IPriceEstimationClient)Activator.CreateInstance(type,+restClientFactory));
++++++++++++}
++++++++}
++++}
++++#endregion

++++#region+Public+Methods

++++///+<summary>
++++///+TODO:+This+needs+to+be+averaged.+The+two+current+clients+give+wildly+different+values.+Need+to+include+some+Australian+exchanges+etc.
++++///+</summary>
++++public+async+Task<EstimatedPricesModel>+GetPrices(IEnumerable<CurrencySymbol>+currencySymbols,+string+fiatCurrency)
++++{
++++++++//Lets+try+a+client+that+hasn't+been+used+before+if+there+is+one
++++++++var+client+=+_Clients.FirstOrDefault(c+=>+c.AverageCallTimespan.TotalMilliseconds+==+0);
++++++++var+currencies+=+currencySymbols.ToList();
++++++++if+(client+!=+null)
++++++++{
++++++++++++try
++++++++++++{
++++++++++++++++return+await+client.GetPrices(currencies,+fiatCurrency);
++++++++++++}
++++++++++++catch
++++++++++++{
++++++++++++++++//Do+nothing
++++++++++++}
++++++++}

++++++++foreach+(var+client2+in+_Clients.OrderBy(c+=>+c.SuccessRate).ThenBy(c+=>+c.AverageCallTimespan).ToList())
++++++++{
++++++++++++try
++++++++++++{
++++++++++++++++return+await+client2.GetPrices(currencies,+fiatCurrency);
++++++++++++}
++++++++++++catch+(Exception+ex)
++++++++++++{
++++++++++++++++Logger.Log("Error+Getting+Prices",+ex,+nameof(PriceEstimationManager));
++++++++++++}
++++++++}

++++++++throw+new+Exception("Can't+get+prices");
++++}
++++#endregion
}|36s65|在更高的级别上，您可以像这样使用代码(https://github.com/MelbourneDeveloper/CryptoCurrency.Net/blob/master/src/CryptoCurrency.Net.UnitTests/PricingTests.cs)：|22qbr|public+async+Task+GetUSDBitcoinPrice()
{
++++var+priceEstimationManager+=+new+PriceEstimationManager(new+RESTClientFactory());
++++var+estimatedPrice+=+await+priceEstimationManager.GetPrices(new+List<CurrencySymbol>+{+CurrencySymbol.Bitcoin+},+"USD");
++++Console.WriteLine($"Estimate:+{estimatedPrice.Result.First().FiatEstimate}");
}|66s9n|随着定价客户的增加，它将变得越来越可靠。|38vff^0|0|R|44|0|0|0|1B|47|1|0|0|J|39|2|0|0|0^^$0|$1|$2|3|4|5|6|$7|8]]|9|$2|3|4|5|6|$7|A]]|B|$2|3|4|5|6|$7|C]]]|D|@$E|F|G|H|2|I|J|16|K|@]|L|@]|6|$]]|$E|M|G|N|2|I|J|17|K|@]|L|@$O|18|P|19|E|1A]]|6|$]]|$E|Q|G|R|2|S|J|1B|K|@]|L|@]|6|$T|U]]|$E|V|G|W|2|I|J|1C|K|@]|L|@$O|1D|P|1E|E|1F]]|6|$]]|$E|X|G|Y|2|S|J|1G|K|@]|L|@]|6|$T|U]]|$E|Z|G|10|2|I|J|1H|K|@]|L|@$O|1I|P|1J|E|1K]]|6|$]]|$E|11|G|12|2|S|J|1L|K|@]|L|@]|6|$T|U]]|$E|13|G|14|2|I|J|1M|K|@]|L|@]|6|$]]|$E|15|G|-4|2|I|J|1N|K|@]|L|@]|6|$]]]]

There are several APIs out there that will allow you to request the prices for a list of crypto currencies, and/or fiat currencies. The problem is that all the APIs do it in a disparate way. The follow on from that is that any one could be down at any given time, so you need to have some failure tolerance built in. I.e. the code should attempt to use one API, and if that fails, move to the next. Of course, this is further complicated by the fact that price is subjective and localised to a given country, exchange and so on. So, getting an accurate value is very difficult. 

Here is example Crypto Compare client from CryptoCurrency.Net (<a href="https://github.com/MelbourneDeveloper/CryptoCurrency.Net/blob/master/src/CryptoCurrency.Net/APIClients/PriceEstimationClients/CryptoCompareClient.cs" rel="nofollow noreferrer">https://github.com/MelbourneDeveloper/CryptoCurrency.Net/blob/master/src/CryptoCurrency.Net/APIClients/PriceEstimationClients/CryptoCompareClient.cs</a>):

<pre><code>public class CryptoCompareClient : PriceEstimationClientBase, IPriceEstimationClient
 {
 public CryptoCompareClient(IRestClientFactory restClientFactory) : base(restClientFactory)
 {
 RESTClient = restClientFactory.CreateRESTClient(new Uri("https://min-api.cryptocompare.com"));
 }

 protected override Func&lt;GetPricesArgs, Task&lt;EstimatedPricesModel&gt;&gt; GetPricesFunc { get; } = async a =&gt;
 {
 var retVal = new EstimatedPricesModel();

 if (a.Currencies.ToList().Count == 0)
 {
 return retVal;
 }

 retVal.LastUpdate = DateTime.Now;

 var symbolsPart = string.Join(",", a.Currencies.Select(c =&gt; c.Name));

 var priceJson = await a.RESTClient.GetAsync&lt;string&gt;($"data/pricemultifull?fsyms={symbolsPart}&amp;tsyms={a.FiatCurrency}");

 var jObject = (JObject)JsonConvert.DeserializeObject(priceJson);

 var rawNode = (JObject)jObject.First.First;

 foreach (JProperty coinNode in rawNode.Children())
 {
 var fiatNode = (JProperty)coinNode.First().First;

 var allProperties = fiatNode.First.Children().Cast&lt;JProperty&gt;().ToList();

 var change24HourProperty = allProperties.FirstOrDefault(p =&gt; string.Compare(p.Name, "CHANGEPCT24HOUR", true) == 0);
 var priceProperty = allProperties.FirstOrDefault(p =&gt; string.Compare(p.Name, "PRICE", true) == 0);

 var price = (decimal)priceProperty.Value;
 var change24Hour = (decimal)change24HourProperty.Value;
 retVal.Result.Add(new CoinEstimate { CurrencySymbol = new CurrencySymbol(coinNode.Name), ChangePercentage24Hour = change24Hour, FiatEstimate = price, LastUpdate = DateTime.Now });
 }

 //Extreme hack. It's better to show zero than nothing at all and get the coins stuck
 foreach (var currency in a.Currencies)
 {
 if (retVal.Result.FirstOrDefault(ce =&gt; ce.CurrencySymbol.Equals(currency)) == null)
 {
 retVal.Result.Add(new CoinEstimate { ChangePercentage24Hour = 0, CurrencySymbol = currency, FiatEstimate = 0, LastUpdate = DateTime.Now });
 }
 }

 return retVal;
 };
}
</code></pre>

The PriceEstimationManager will flick through APIs until it finds one that works (<a href="https://github.com/MelbourneDeveloper/CryptoCurrency.Net/blob/master/src/CryptoCurrency.Net/APIClients/PriceEstimationClients/PriceEstimationManager.cs" rel="nofollow noreferrer">https://github.com/MelbourneDeveloper/CryptoCurrency.Net/blob/master/src/CryptoCurrency.Net/APIClients/PriceEstimationClients/PriceEstimationManager.cs</a>):

<pre><code>public class PriceEstimationManager
{
 #region Fields
 private readonly Collection&lt;IPriceEstimationClient&gt; _Clients = new Collection&lt;IPriceEstimationClient&gt;();
 #endregion

 #region Constructor
 public PriceEstimationManager(IRestClientFactory restClientFactory)
 {
 foreach (var typeInfo in typeof(PriceEstimationManager).GetTypeInfo().Assembly.DefinedTypes)
 {
 var type = typeInfo.AsType();

 if (typeInfo.ImplementedInterfaces.Contains(typeof(IPriceEstimationClient)))
 {
 _Clients.Add((IPriceEstimationClient)Activator.CreateInstance(type, restClientFactory));
 }
 }
 }
 #endregion

 #region Public Methods

 /// &lt;summary&gt;
 /// TODO: This needs to be averaged. The two current clients give wildly different values. Need to include some Australian exchanges etc.
 /// &lt;/summary&gt;
 public async Task&lt;EstimatedPricesModel&gt; GetPrices(IEnumerable&lt;CurrencySymbol&gt; currencySymbols, string fiatCurrency)
 {
 //Lets try a client that hasn't been used before if there is one
 var client = _Clients.FirstOrDefault(c =&gt; c.AverageCallTimespan.TotalMilliseconds == 0);
 var currencies = currencySymbols.ToList();
 if (client != null)
 {
 try
 {
 return await client.GetPrices(currencies, fiatCurrency);
 }
 catch
 {
 //Do nothing
 }
 }

 foreach (var client2 in _Clients.OrderBy(c =&gt; c.SuccessRate).ThenBy(c =&gt; c.AverageCallTimespan).ToList())
 {
 try
 {
 return await client2.GetPrices(currencies, fiatCurrency);
 }
 catch (Exception ex)
 {
 Logger.Log("Error Getting Prices", ex, nameof(PriceEstimationManager));
 }
 }

 throw new Exception("Can't get prices");
 }
 #endregion
}
</code></pre>

At a higher level, you can use the code like this (<a href="https://github.com/MelbourneDeveloper/CryptoCurrency.Net/blob/master/src/CryptoCurrency.Net.UnitTests/PricingTests.cs" rel="nofollow noreferrer">https://github.com/MelbourneDeveloper/CryptoCurrency.Net/blob/master/src/CryptoCurrency.Net.UnitTests/PricingTests.cs</a>):

<pre><code>public async Task GetUSDBitcoinPrice()
{
 var priceEstimationManager = new PriceEstimationManager(new RESTClientFactory());
 var estimatedPrice = await priceEstimationManager.GetPrices(new List&lt;CurrencySymbol&gt; { CurrencySymbol.Bitcoin }, "USD");
 Console.WriteLine($"Estimate: {estimatedPrice.Result.First().FiatEstimate}");
}
</code></pre>

As more pricing clients are added, it will get more and more reliable.

I want to get Bitcoin value for corresponding USD value and store it in table or variable. I got this URL from which I can get a Bitcoin value for USK amount. I searched on blockchain and I found this URL.

For example:

<pre><code>500usd = 0.76105818 btc
</code></pre>

I tried:

<pre><code>https://blockchain.info/tobtc?currency=USD&amp;value=500
</code></pre>

at the end, its USD value which we want to convert in Bitcoin.
I want to get the result in the variable in C# (backend).

How can I accomplish this?

How to get Bitcoin value for corresponding USD value in ASP.NET C#?

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技术创作特训营有奖征文

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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文章&问答评论现已支持表情

 我想获得相应美元价值的比特币价值，并将其存储在表或变量中。我得到了这个URL，从中我可以获得USK amount的比特币价值。我在区块链上搜索，找到了这个网址。 例如： 500usd = 0.76105818 btc 我试过了： https://blockchain.info/tobtc?currency=USD&value=500 最后，它的美元价值，我们想要转换成比特币。我想在C# (后端)

问如何在ASP.NET C#中获取对应美元的比特币价值？
EN

回答 4

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问如何在ASP.NET C#中获取对应美元的比特币价值？
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