c# - 无法使用直线在 Webchat 中发送附件，相同的代码在模拟器中运行良好

Question

var response = MessageFactory.Attachment(new Attachment
{
     Name = @"application.png",
     ContentType = "image/png",
     ContentUrl =  "base64sting"
});

await dc.Context.SendActivityAsync(response);

当我尝试向用户发送附件时，上面的代码在网络聊天中抛出以下异常，在模拟器中它工作正常

at Microsoft.Bot.Connector.Conversations.ReplyToActivityWithHttpMessagesAsync(String conversationId, String activityId, Activity activity, Dictionary`2 customHeaders, CancellationToken cancellationToken) in D:\a\1\s\libraries\Microsoft.Bot.Connector\Conversations.cs:line 1121

at Microsoft.Bot.Connector.ConversationsExtensions.ReplyToActivityAsync(IConversations operations, String conversationId, String activityId, Activity activity, CancellationToken cancellationToken) in D:\a\1\s\libraries\Microsoft.Bot.Connector\ConversationsExtensions.cs:line 241

at Microsoft.Bot.Builder.BotFrameworkAdapter.SendActivitiesAsync(ITurnContext turnContext, Activity[] activities, CancellationToken cancellationToken) in D:\a\1\s\libraries\Microsoft.Bot.Builder\BotFrameworkAdapter.cs:line 316

at Microsoft.Bot.Builder.TurnContext.<>c__DisplayClass22_0.d.MoveNext() in D:\a\1\s\libraries\Microsoft.Bot.Builder\TurnContext.cs:line 267

我什至尝试过这个

using (var connector = new ConnectorClient(new Uri(serviceUrl)))
{
    var attachments = new Attachments(connector);
    var response = await attachments.Client.Conversations.UploadAttachmentAsync(
        conversationId,
        new AttachmentData
        {
            Name = @"Resources\architecture-resize.png",
            OriginalBase64 = File.ReadAllBytes(imagePath),
            Type = "image/png",
        }
    );

    var attachmentUri = attachments.GetAttachmentUri(response.Id);

    return new Attachment
    {
        Name = @"Resources\architecture-resize.png",
        ContentType = "image/png",
        ContentUrl = attachmentUri,
    };
}

这也失败了，是否有任何解决方法可以在没有托管内容 url 的情况下使用网络聊天向用户发送附件？

Answer 1

对于那些面临这个问题的人，下面是根本原因。

我试图将图像作为一个项目发送以单击并保存，我想我找到了问题，directline 仅支持 4MB 消息大小，我的图像的 base64string 非常大，导致消息超过 4MB，现在我将图像上传到 azure blob 并将 blob uri 用作 contentURI ，它现在正在运行