如何从 https URL 下载 CSV 文件到字符串？

Question

当我从本地文件读取所有文本时，我在此处列出的代码有效。我需要做的是将路径 "C:\LocalFiles\myFile.csv" 替换为“https://mySite.blah/myFile.csv”。

我尝试了几种方法，但似乎无法将 csv 文件加载到字符串变量中。如果我能做到这一点，那么代码对我来说就可以了。

var csv = System.IO.File.ReadAllText(@"C:\LocalFiles\myFile.csv");

StringBuilder sb = new StringBuilder();
using (var p = ChoCSVReader.LoadText(csv).WithFirstLineHeader())
{
    p.Configuration.NullValue = null;

    if (p.Configuration.CSVRecordFieldConfigurations.IsNullOrEmpty())
    {
        p.Configuration.NullValue = null;
    }

    // ChoIgnoreFieldValueMode.DBNull = ChoIgnoreFieldValueMode.Empty();
    using (var w = new ChoJSONWriter(sb))
        w.Write(p);
}
string fullJson = sb.ToString();

如果我只是替换路径，我会收到一条错误消息，指出路径无效。

Answer 1

您需要使用网络请求获取字符串：

string urlAddress = "https://mySite.blah/myFile.csv";

    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(urlAddress);
    HttpWebResponse response = (HttpWebResponse)request.GetResponse();

    if (response.StatusCode == HttpStatusCode.OK)
    {
        Stream receiveStream = response.GetResponseStream();
        StreamReader readStream = null;
        if (response.CharacterSet == null)
        {
            readStream = new StreamReader(receiveStream);
        }
        else
        {
            readStream = new StreamReader(receiveStream,
            Encoding.GetEncoding(response.CharacterSet));
        }

        string data = readStream.ReadToEnd();
        response.Close();
        readStream.Close();
     }

或使用网络客户端：

WebClient wc = new WebClient();
string data = wc.DownloadString("https://mySite.blah/myFile.csv");

然后将 data 传递到您的 reader 而不是使用 System.IO.File.ReadAllText(@"C:\LocalFiles\myFile.csv");

以上两个示例均假定文件在 url 时可公开访问，无需身份验证或特定 header 值。

Answer 2

替换此行

var csv = System.IO.File.ReadAllText(@"C:\LocalFiles\myFile.csv");

和

string result = client.GetStringAsync("https://mySite.blah/myFile.csv").Result;

或

var textFromFile = (new WebClient()).DownloadString("https://mySite.blah/myFile.csv");

还有许多其他方法可以做到这一点。只是 google 它。

如何从 https URL 下载 CSV 文件到字符串？

How do I download a CSV file to a string from an https URL?

c#

csv

choetl