从ViewBag载入文件？

我有一个Razor页面，我在其中加载了一些数据（不是表格形式），并且这些“字段”之一是一个文件。

<div class="col-sm-3">
   <label>Upload Construction Map:</label>
   <br />
   <div class="input-group">
      <span class="input-group-btn">
         <span class="btn btn-primary btn-file">
            Browse @Html.TextBoxFor(m => m.ShapeFileModel.ConstructFile, new { id = "fu-construct", type = "file", accept = ".pdf" })
         </span>
      </span>
      @{
         if (fileId != "")
         {
            int theId = int.Parse(fileId);
            CrossCData.DAL.File fileMap = (from f in dbCrossingsCloud.Files
                                           where f.Id == theId
                                           select f).SingleOrDefault();
      <input type="text" id="txtPathConstruct" class="form-control" value="@fileMap.FileName" contenteditable="false" readonly />
         }
         else
         {
      <input type="text" id="txtPathConstruct" class="form-control" value="" contenteditable="false" readonly />
         }
      }
   </div>
</div>

我在ViewBag.fileId中返回文件的ID，然后获取存储在文件系统（而非数据库）中的文件的详细信息。所以...文件位置（文件夹路径）和文件名。

是否可以在Razor中使用IO将文件加载到输入中？和一个JavaScript变量？

任何帮助将不胜感激！

我用来管理文件的Javascript

$("#fu-construct").fileupload({
        url: 'UploadConstructFile',
        dataType: 'json',
        // File was added
        add: function (e, data) {
            var fileExtension = ['pdf'];  // Valid file extensions
            if ($.inArray($("#txtPathConstruct").val().split('.').pop().toLowerCase(), fileExtension) == -1) {
                swal("Error", "Only PDF files are allowed. Please select a file in PDF format.", "error");
                $("#txtPathConstruct").val("No file chosen...");
                constructData = null;
            } else {
                constructData = data;
            }
        },
        // UploadConstructFile is done
        done: function (event, data) {
            fileId = data.result.fileId;
            if (projectCompany == "" || typeof projectCompany == 'undefined') {
                swal("Error", "Please enter a requesting company", "error");
            }
            else if (projectName == "" || typeof projectName == 'undefined') {
                swal("Error", "Please enter a project name.", "error");
            }
            else if (projectType == "" || typeof projectType == 'undefined') {
                swal("Error", "Please select a project type.", "error");
            }
            else {
                post('Audit', 'post', JSON.stringify(myDataTable.rows().data().toArray()), fileId, projectCompany, projectName, projectType, projectFileNumber, projectAFECC);
            }
        },
        fail: function (event, data) {
            alert("Error uploading the file.");
            $("#txtPathShape").val("No file chosen...");
        }
    });

    $("#construct-upload").on('click', function () {
        if (constructData) {
            constructData.submit();
        }
        return false;
    });