Question

我只是想将文件路径返回到新创建的PDF并在新窗口中打开它。

当我运行此代码时，我打开一个404窗口并转到/null页面。我假设这意味着我从CreateLabelPdf C＃代码返回一个空值。

有谁知道为什么我被归还null以及如何修复它？

的Javascript

function createLabelPdf(sampleIds, line1, line2, line3, loginMatrix, labelStart) {
    var labelInfo = new Object();
    labelInfo.sampleIds = sampleIds;
    labelInfo.line1 = line1;
    labelInfo.line2 = line2;
    labelInfo.line3 = line3;
    labelInfo.labelType = loginMatrix;
    labelInfo.startingLabelPosition = labelStart;


    $.ajax({
        type: "POST",
        url: "DesktopModules/DataManagement/TestService.svc/CreateLabelPdf",
        data: JSON.stringify(labelInfo),
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function(data) {
           window.open(data.d);

        }   
    });
}

C＃服务

[OperationContract]
public string CreateLabelPdf(List<string> sampleIds, string line1, string line2, string line3, string labelType, int startingLabelPosition)
{
    List<LabelContent> labels = new List<LabelContent>();


    foreach (var sample in sampleIds)
    {
        LabelContent labelContent = new LabelContent();
        labelContent.Line1 = line1;
        labelContent.Line2 = line2;
        labelContent.Line3 = line3;

        labelContent.LabelId = sample;

        labels.Add(labelContent);
    }

    Creator creator = new Creator
    {
        IncludeLabelBorders = false
    };


    string path = HttpContext.Current.Server.MapPath(@"~\DesktopModules\DataManagement\Pdf\" + 0 + ".pdf");

    creator.PrintLabels(labels, new Avery5160(), path, startingLabelPosition);

    return path;
}

Answer 1

所以我终于明白了。我调试了代码并发现错误在这一行：

string path = HttpContext.Current.Server.MapPath(@"~\DesktopModules\DataManagement\Pdf\" + 0 + ".pdf");

它得到一个空引用错误，所以我将代码更改为：

string path = System.Web.Hosting.HostingEnvironment.MapPath(@"~\DesktopModules\DataManagement\Pdf\" + 0 + ".pdf");

虽然有效但我需要将相对字符串返回到浏览器而不是物理路径，所以我投入了：

string relativePath = @"\DesktopModules\DataManagement\Pdf\0.pdf";
return relativePath;

结尾代码如下：

string path = System.Web.Hosting.HostingEnvironment.MapPath(@"~\DesktopModules\DataManagement\Pdf\" + 0 + ".pdf");

creator.PrintLabels(labels, new Avery5160(), path, startingLabelPosition);

string relativePath = @"\DesktopModules\DataManagement\Pdf\0.pdf";
return relativePath;

从webservice返回文件路径并在新窗口中打开它

1 个答案: