Typescript Download PDF file-CodePudding

I am trying to download this PDF file using this AJAX Post and returning the templateFile Model. I am getting the error cannot convert type TemplateFileDto to IhttpActionResult. Should I Return something different? Any help would be great.

printItems(versionKeys: string[]): JQueryPromise<any> {
        console.log('printItems');
        $.ajax({
            type: "post",
            contentType: "application/json",
            data: JSON.stringify(versionKeys),
            url: this.apiUrls.PrintTemplates,
            success: function (data, status, xhr) {
                var file = new Blob([data], { type: 'application/pdf' });
                var fileURL = URL.createObjectURL(file);
                window.open(fileURL);


                console.log('success');

            }
        });

        return;
    }

Controller

[HttpGet, HttpPost]
[ApplicationApiAuthorize("Administrator, ContentManager")]
public IHttpActionResult PrintTemplates([FromBody] List<string> versionKeys)
{

    var templates = versionKeys
            .Select(v => TemplatesDataService.GetTemplate(v))
            .ToList();

    var templateIds = templates.Select(b => b.Id).ToList();

    var templateFile = TemplatesDataService.PrintTemplate(templateIds);

    return templateFile;
}

Model

 public class TemplateFileDto
    {
        public long? Id { get; set; }
        public byte[] Content { get; set; }
        public string FileName { get; set; }
        public string ContentType { get; set; }
    }

CodePudding user response：

The return type for your PrintTemplates method is IHttpActionResult; however, the type of your templateFile variable is TemplateFileDto.

Since there's no relationship between TemplateFileDto and IHttpActionResult (e.g., TemplateFileDto doesn't implement the IHttpActionResult interface), the compiler cannot implicitly convert this variable to the appropriate type - hence the error.

You can find more detailed information on this error here.

The easiest way to resolve this is by calling the Ok method, with templateFile as a parameter. This will take care of making sure the content you return is formatted correctly and the HTTP response code is set to 200.

It should be as simple as changing your PrintTemplates method from this:

return templateFile;

To this:

return Ok(templateFile);