Kendo Grid在大型数据集上导出到Excel错误

Question

I am getting the below error when trying to export to Excel from a Kendo grid of large data. It's working fine when we have small data on grid.

Error during serialization or deserialization using the JSON JavaScriptSerializer. The length of the string exceeds the value set on the maxJsonLength property

.Excel(excel => excel
    .FileName("Trip List Export.xlsx")
    .Filterable(false)
    .ProxyURL(Url.Action("ExcelExport", "Grid"))
    .AllPages(true)
)

public ActionResult ExcelExport(string contentType, string base64, string fileName)
{
    var fileContents = Convert.FromBase64String(base64);
    return File(fileContents, contentType, fileName);
}

Answer 1

Remove the "Excel" part and add this

.ToolBar(toolBar => { toolBar.Custom().Text("Export To Excel")
            .HtmlAttributes(new { @class = "export" })
            .Url(Url.Action("ExcelExport", "Grid")); })

then , in controller:

    public ActionResult ExcelExport([DataSourceRequest]DataSourceRequest request 
    { 

        var workbook = new HSSFWorkbook();

        //Create new Excel sheet
        var sheet = workbook.CreateSheet();

        //(Optional) set the width of the columns
        sheet.SetColumnWidth(0, 10 * 256);
        sheet.SetColumnWidth(1, 50 * 256);
        sheet.SetColumnWidth(2, 50 * 256);
        sheet.SetColumnWidth(3, 50 * 256);

        //Create a header row
        var headerRow = sheet.CreateRow(0);

        //Set the column names in the header row
        headerRow.CreateCell(0).SetCellValue("Product ID");
        headerRow.CreateCell(1).SetCellValue("Product Name");
        headerRow.CreateCell(2).SetCellValue("Unit Price");
        headerRow.CreateCell(3).SetCellValue("Quantity Per Unit");

        //(Optional) freeze the header row so it is not scrolled
        sheet.CreateFreezePane(0, 1, 0, 1);
        var models = _priceRepository.Get().ToDataSourceResult(request).Data;
        int rowNumber = 1;

        //Populate the sheet with values from the grid data
        foreach (RentPriceModel model in models)
        {
            //Create a new row
            var row = sheet.CreateRow(rowNumber++);

            //Set values for the cells
            row.CreateCell(0).SetCellValue(model.Id);
            row.CreateCell(1).SetCellValue(model.Branch.Name);
            row.CreateCell(2).SetCellValue(model.CarClass.Name);
            row.CreateCell(3).SetCellValue(model.Interval);
        }

        //Write the workbook to a memory stream
        MemoryStream output = new MemoryStream();
        workbook.Write(output);

        //Return the result to the end user

        return File(output.ToArray(),   //The binary data of the XLS file
            "application/vnd.ms-excel", //MIME type of Excel files
            "GridExcelExport.xls");
    }`

Note that I use my custom models and also this library