Asp.net web api 从Web API下载csv文件不会启动

Asp.net web api 从Web API下载csv文件不会启动,asp.net-web-api,export-to-csv,httpresponsemessage,Asp.net Web Api,Export To Csv,Httpresponsemessage,我有来自不同来源的示例代码,我想先试用一下,然后再将其应用到我的代码中,这与我得到的示例非常相似 我的控制器中有以下代码: [Route("getcsv")] [HttpGet] public HttpResponseMessage GetCSV() { var data = new[]{ //Suppose you filter out these data new{ Name="Ram", E

我有来自不同来源的示例代码,我想先试用一下,然后再将其应用到我的代码中,这与我得到的示例非常相似

我的控制器中有以下代码:

[Route("getcsv")]
    [HttpGet]
    public HttpResponseMessage GetCSV()
    {
        var data = new[]{   //Suppose you filter out these data

                           new{ Name="Ram", Email="ram@techbrij.com", Phone="111-222-3333" },
                           new{ Name="Shyam", Email="shyam@techbrij.com", Phone="159-222-1596" },
                           new{ Name="Mohan", Email="mohan@techbrij.com", Phone="456-222-4569" },
                           new{ Name="Sohan", Email="sohan@techbrij.com", Phone="789-456-3333" },
                           new{ Name="Karan", Email="karan@techbrij.com", Phone="111-222-1234" },
                           new{ Name="Brij", Email="brij@techbrij.com", Phone="111-222-3333" }
                  };

        HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK);
        result.Content = new StringContent(WriteTsv(data));
        result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
        result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment"); //attachment will force download
        result.Content.Headers.ContentDisposition.FileName = "RecordExport.csv";


        return result;
    }

    public string WriteTsv<T>(IEnumerable<T> data)
    {
        StringBuilder output = new StringBuilder();
        PropertyDescriptorCollection props = TypeDescriptor.GetProperties(typeof(T));
        foreach (PropertyDescriptor prop in props)
        {
            output.Append(prop.DisplayName); // header
            output.Append("\t");
        }
        output.AppendLine();
        foreach (T item in data)
        {
            foreach (PropertyDescriptor prop in props)
            {
                output.Append(prop.Converter.ConvertToString(
                     prop.GetValue(item)));
                output.Append("\t");
            }
            output.AppendLine();
        }
        return output.ToString();
    }
[路由(“getcsv”)]
[HttpGet]
公共HttpResponseMessage GetCSV()
{
var data=new[]{//假设您过滤掉这些数据
新的{Name=“Ram”,电子邮件=”ram@techbrij.com,Phone=“111-222-3333”},
新的{Name=“Shyam”,电子邮件=”shyam@techbrij.com,Phone=“159-222-1596”},
新的{Name=“Mohan”,电子邮件=”mohan@techbrij.com,Phone=“456-222-4569”},
新的{Name=“Sohan”,电子邮件=”sohan@techbrij.com,Phone=“789-456-3333”},
新的{Name=“Karan”,电子邮件=”karan@techbrij.com,Phone=“111-222-1234”},
新的{Name=“Brij”,电子邮件=”brij@techbrij.com“,Phone=“111-222-3333”}
};
HttpResponseMessage结果=新的HttpResponseMessage(HttpStatusCode.OK);
result.Content=newstringcontent(WriteTsv(数据));
result.Content.Headers.ContentType=新的MediaTypeHeaderValue(“应用程序/八位字节流”);
result.Content.Headers.ContentDisposition=新的ContentDispositionHeaderValue(“附件”);//附件将强制下载
result.Content.Headers.ContentDisposition.FileName=“RecordExport.csv”;
返回结果;
}
公共字符串WriteTsv(IEnumerable数据)
{
StringBuilder输出=新的StringBuilder();
PropertyDescriptorCollection props=TypeDescriptor.GetProperties(typeof(T));
foreach(PropertyDescriptor道具中的道具)
{
output.Append(prop.DisplayName);//头
output.Append(“\t”);
}
AppendLine();
foreach(数据中的T项)
{
foreach(PropertyDescriptor道具中的道具)
{
output.Append(prop.Converter.ConvertToString(
道具价值(项目));
output.Append(“\t”);
}
AppendLine();
}
返回output.ToString();
}
我通过以下方式调用此方法:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title></title>

    <script type="text/javascript">
        function save() {
            window.open('https://localhost:44370/api/values/getcsv', '_blank', '');
        }
    </script>
</head>
<body>
    <a class="btn btn-primary" onclick="save()">Export</a>
</body>
</html>

函数save(){
打开窗户https://localhost:44370/api/values/getcsv","空白","空白",;
}


我不知道我错过了什么。请帮忙!谢谢大家!

您的Web API版本很可能使用了错误的语法

如果使用Asp.Net核心Web API,则需要将其重构为

[Route("api/[controller]")]
public class ValuesController: Controller {
    //GET api/values/getcsv
    [Route("getcsv")]
    [HttpGet]
    public IActionResult GetCSV() {
        var data = new[]{   //Suppose you filter out these data
           new{ Name="Ram", Email="ram@techbrij.com", Phone="111-222-3333" },
           new{ Name="Shyam", Email="shyam@techbrij.com", Phone="159-222-1596" },
           new{ Name="Mohan", Email="mohan@techbrij.com", Phone="456-222-4569" },
           new{ Name="Sohan", Email="sohan@techbrij.com", Phone="789-456-3333" },
           new{ Name="Karan", Email="karan@techbrij.com", Phone="111-222-1234" },
           new{ Name="Brij", Email="brij@techbrij.com", Phone="111-222-3333" }
        };

        var bytes = System.Text.Encoding.UTF8.GetBytes(WriteTsv(data));
        return File(bytes, "application/octet-stream", "RecordExport.csv");
    }

    //...code omitted for brevity

}

在Asp.Net中,Core
HttpResponseMessage
不再被视为管道的一级公民,而是像普通模型一样被序列化。

您使用的是什么版本的web api?如果是核心,那就是问题所在。HttpResponseMessage不再是管道的一级公民,正在像普通模型一样进行序列化。非常感谢。这解决了我的问题!是的,我正在使用.NetCore2.2。