Rotativa无法对空引用asp.net核心执行运行时绑定

Question

问题

我正在尝试使用Rotativa在asp.net核心中创建pdf,但它给我一个错误.我想创建html并将其转换为pdf,然后存储在服务器目录中

错误

码

[HttpPost]
    public IActionResult Index(Invoice invoice)
    {
        var webRoot = _env.WebRootPath;

        var pdf = new ViewAsPdf("Index")
        {
            FileName = "Test.pdf",
            PageSize = Rotativa.AspNetCore.Options.Size.A4,
            PageOrientation = Rotativa.AspNetCore.Options.Orientation.Portrait,
            PageHeight = 20,

        };

        var byteArray = pdf.BuildFile(ControllerContext).Result;
        //var fileStream = new MemoryStream(Path.Combine(webRoot, pdf.FileName), FileMode.Create, FileAccess.Write);
        var memoryStream = new MemoryStream(byteArray, 0, byteArray.Length);
    }

Answer 1

回答

该错误表示您尚未配置Rotativa.

像这样配置您的应用程序:

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    app.UseStaticFiles();
    app.UseMvcWithDefaultRoute();
    Rotativa.AspNetCore.RotativaConfiguration.Setup(env);
}

也wkhtmltopdf.exe像这样添加到wwwroot:

wwwroot
    Rotativa
        wkhtmltopdf.exe

完成后,以下内容将起作用.

public async Task<IActionResult> Index()
{
    var pdf = new Rotativa.AspNetCore.ViewAsPdf("Index")
    {
        FileName = "C:\\Test.pdf",
        PageSize = Rotativa.AspNetCore.Options.Size.A4,
        PageOrientation = Rotativa.AspNetCore.Options.Orientation.Portrait,
        PageHeight = 20,
    };

    var byteArray = await pdf.BuildFile(ControllerContext);
    return File(byteArray, "application/pdf");
}

注意使用async/await而不是使用.Result.

也可以看看:

• 需要配置部分https://github.com/webgio/Rotativa.AspNetCore

• 这里的GitHub演示https://github.com/shaunluttin/asp-net-core-rotativa-pdf

• 在这里下载wkhtmltopdf https://wkhtmltopdf.org/