C# 路径错误c中的非法字符#

我试图从下面的链接下载csv文件，但在最后一行抛出了一个异常“路径错误中的非法字符”。我相信是链接中的问号把一切都搞砸了，但我必须让它工作起来。。有什么建议吗

string remoteUri = "download.finance.yahoo.com/d/quotes.csv?s=%40%5EDJI,aapl&f=o&e=.csv";
string fileName = "aapl.csv", myStringWebResource = null;
// Create a new WebClient instance.
WebClient myWebClient = new WebClient();
// Concatenate the domain with the Web resource filename.
myStringWebResource = remoteUri + fileName;
// Download the Web resource and save it into the current filesystem folder.
myWebClient.DownloadFile(myStringWebResource, fileName);

这项工作：

string remoteUri = @"http://download.finance.yahoo.com/d/quotes.csv?s=%40%5EDJI,aapl&f=o&e=.csv";
string fileName = @"c:\aapl.csv";

// Create a new WebClient instance.
WebClient myWebClient = new WebClient();       

// Download the Web resource and save it into the current filesystem folder.
myWebClient.DownloadFile(remoteUri, fileName);

---

嗯。让我们看看你的代码

// Dont forget the "http://". A lot of browser add it themselves but the WebClient doesnt.
string remoteUri = "download.finance.yahoo.com/d/quotes.csv?s=%40%5EDJI,aapl&f=o&e=.csv";

// I recommend to take the habitude to write each one in one line.
string fileName = "aapl.csv", myStringWebResource = null;

// Use the "using" keyword to dispose WebClient
WebClient myWebClient = new WebClient();

// Why are you doing this? Your url is working without. No need to concat here.
myStringWebResource = remoteUri + fileName;

// Download the Web resource and save it into the current filesystem folder.
myWebClient.DownloadFile(myStringWebResource, fileName);

测试解决方案：（在上演示）

您问题的解决方案：

using System;
using System.Net;

public class Program
{
    public void Main()
    {
        string remoteUri = "http://download.finance.yahoo.com/d/quotes.csv?s=%40%5EDJI,aapl&f=o&e=.csv";
        string fileName = "aapl.csv";

        using (var myWebClient = new WebClient())
        {
            myWebClient.DownloadFile(remoteUri, fileName);
        }   
    }
}

---

您可以用另一个字符替换问号…问号是有效的url字符。为什么您的uri不以协议开头？myStringWebResource是“download.finance.yahoo.com/d/quotes.csv？s=%40%5EDJI，aapl&f=o&e=.csvaapl.csv”这似乎不正确。我认为您的问题是

mystringwebsource=remoteUri+fileName，只是不要这样做。然后将最后一行替换为
myWebClient.DownloadFile（remoteUri，fileName）不要忘记处理WebClient。看看我的答案。
using System;
using System.Net;

public class Program
{
    public void Main()
    {
        string remoteUri = "http://download.finance.yahoo.com/d/quotes.csv?s=%40%5EDJI,aapl&f=o&e=.csv";
        string fileName = "aapl.csv";

        using (var myWebClient = new WebClient())
        {
            myWebClient.DownloadFile(remoteUri, fileName);
        }   
    }
}