[英]cannot convert from system.threding.Tasks .task<byte[]> to byte[]
I am new to c# and react.我是 c# 的新手并做出反应。 I am using the following method to convert image url to bytes
我正在使用以下方法将图像 url 转换为字节
return Convert.ToBase64String(bytes);
but I am getting an error which says但我收到一个错误,上面写着
cannot convert from
System.Threading.Tasks.Task<byte[]>
tobyte[]
无法从
System.Threading.Tasks.Task<byte[]>
转换为byte[]
This is the method:这是方法:
[HttpGet]
[Route("GetImages")]
public IHttpActionResult GetImages()
{
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
WebProxy myproxy = new WebProxy("corpproxy1.tatasteel.com", 80);
myproxy.BypassProxyOnLocal = false;
//myproxy.UseDefaultCredentials = true;
HttpClientHandler handler = new HttpClientHandler()
{
Proxy = myproxy
};
using (var client = new HttpClient(handler))
{
var bytes =
client.GetByteArrayAsync("https://firebasestorage.googleapis.com/v0/b/tsl-coil-
qlty-monitoring-dev.appspot.com/o/1a60ce3b-eddf-4e72-b2af-b6e99873e926?
alt=media&token=61399a02-1009-4bb9-ad89-d1235df900e4");
return Convert.ToBase64String(bytes);
}
}
How do I correct this error?我该如何纠正这个错误?
GetByteArrayAsync
is an async method, which returns a Task. GetByteArrayAsync
是一个异步方法,它返回一个任务。 You need to await the task to get the return value.您需要等待任务以获取返回值。 In order to await it, the action method has to be async.
为了等待它,动作方法必须是异步的。
[HttpGet]
[Route("GetImages")]
public async Task<IHttpActionResult> GetImages()
{
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
WebProxy myproxy = new WebProxy("corpproxy1.tatasteel.com", 80);
myproxy.BypassProxyOnLocal = false;
HttpClientHandler handler = new HttpClientHandler()
{
Proxy = myproxy
};
using (var client = new HttpClient(handler))
{
var bytes = await client.GetByteArrayAsync("https://firebasestorage.googleapis.com/v0/b/tsl-coil-
qlty-monitoring-dev.appspot.com/o/1a60ce3b-eddf-4e72-b2af-b6e99873e926?
alt=media&token=61399a02-1009-4bb9-ad89-d1235df900e4");
return Convert.ToBase64String(bytes);
}
}
Since GetByteArrayAsync returns Task, you must wait for the task to complete:由于 GetByteArrayAsync 返回 Task,您必须等待任务完成:
var bytes = client.GetByteArrayAsync("https://firebasestorage.googleapis.com/v0/b/tsl-coil-
qlty-monitoring-dev.appspot.com/o/1a60ce3b-eddf-4e72-b2af-b6e99873e926?
alt=media&token=61399a02-1009-4bb9-ad89-d1235df900e4").Result
OR或者
var bytes = await client.GetByteArrayAsync("https://firebasestorage.googleapis.com/v0/b/tsl-coil-
qlty-monitoring-dev.appspot.com/o/1a60ce3b-eddf-4e72-b2af-b6e99873e926?
alt=media&token=61399a02-1009-4bb9-ad89-d1235df900e4")
The second way is usually better than the first, it does not block the thread第二种方式通常比第一种更好,它不会阻塞线程
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