Question

我从预先编写的项目开发应用程序，而构建解决方案时我得到错误：

第9行第45页

;预期

VS IDE为“=＆gt;”添加红色下划线第9行

我正在使用visual studio 2008，我不明白哪里有错。

这是我的代码：

using System;
using System.Net;
using Newtonsoft.Json.Linq;

namespace Main.Tools
{
    internal static class Blockr
    {
        private static string BlockrAddress => "http://btc.blockr.io/api/v1/";
        internal static double GetPrice()
        {
            var request = BlockrAddress + "coin/info/";
        var client = new WebClient();
        var result = client.DownloadString(request);

        var json = JObject.Parse(result);
        var status = json["status"];
        if ((status != null && status.ToString() == "error"))
        {
            throw new Exception(json.ToString());
        }

        return json["data"]["markets"]["coinbase"].Value<double>("value");
    }

    internal static double GetBalanceBtc(string address)
    {
        var request = BlockrAddress + "address/balance/" + address;
        var client = new WebClient();
        var result = client.DownloadString(request);

        var json = JObject.Parse(result);
        var status = json["status"];
        if ((status != null && status.ToString() == "error"))
        {
            throw new Exception(json.ToString());
        }

        return json["data"].Value<double>("balance");
        }
    }
}

Answer 1

第9行你有

private static string BlockrAddress => "http://btc.blockr.io/api/v1/";

此类属性定义是c＃6功能，在vs 2008中不受支持。将其更改为

private static string BlockrAddress {
    get { return "http://btc.blockr.io/api/v1/"; }
}

Answer 2

这是C＃6语法（expression bodied member），仅在Visual Studio 2015之后可用：

private static string BlockrAddress => "http://btc.blockr.io/api/v1/";

将其更改为：

private static string BlockrAddress get { return "http://btc.blockr.io/api/v1/" }; //property

或

private static readonly string BlockrAddress = "http://btc.blockr.io/api/v1/"; //field

它应该解决问题

Answer 3

只需添加private static string BlockrAddress = "http://btc.blockr.io/api/v1/";代替private static string BlockrAddress => "http://btc.blockr.io/api/v1/";

;预期的第9行colum 45

3 个答案: