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CSV Export

You can export the grid to CSV with a click of a button. The current filter, sort, page, grouping and column order are applied to the .csv document.

When you click the Export button, your browser will receive the resulting file.

Basics

To enable the grid CSV Export, add a command button with the CsvExport command name to the toolbar.

<GridToolBar>
    <GridCommandButton Command="CsvExport" Icon="file-csv">Export to CSV</GridCommandButton>
</GridToolBar>

Optionally, you can also set the GridCsvExport tag settings under the GridExport tag to choose:

  • FileName - the name of the file. The grid will add the .csv extension for you.
  • AllPages - whether to export the current page only, or the entire data from the data source.

Export the Grid to CSV - Example

@* You can sort, group, filter, page the grid, reorder its columns, and you can click the
    Export button to save the current data *@

<TelerikGrid Data="@GridData" Pageable="true" Sortable="true" Reorderable="true"
             FilterMode="@GridFilterMode.FilterRow" Groupable="true">

    <GridToolBar>
        <GridCommandButton Command="CsvExport" Icon="file-csv">Export to CSV</GridCommandButton>
        <label class="k-checkbox-label"><TelerikCheckBox @bind-Value="@ExportAllPages" />Export All Pages</label>
    </GridToolBar>

    <GridExport>
        <GridCsvExport FileName="telerik-grid-export" AllPages="@ExportAllPages" />
    </GridExport>

    <GridColumns>
        <GridColumn Field="@nameof(SampleData.ProductId)" Title="ID" />
        <GridColumn Field="@nameof(SampleData.ProductName)" Title="Product Name" />
        <GridColumn Field="@nameof(SampleData.UnitsInStock)" Title="In stock" />
        <GridColumn Field="@nameof(SampleData.Price)" Title="Unit Price" />
        <GridColumn Field="@nameof(SampleData.Discontinued)" Title="Discontinued" />
        <GridColumn Field="@nameof(SampleData.FirstReleaseDate)" Title="Release Date" />
    </GridColumns>
</TelerikGrid>

@code {
    List<SampleData> GridData { get; set; }
    bool ExportAllPages { get; set; }

    protected override void OnInitialized()
    {
        GridData = Enumerable.Range(1, 100).Select(x => new SampleData
        {
            ProductId = x,
            ProductName = $"Product {x}",
            UnitsInStock = x * 2,
            Price = 3.14159m * x,
            Discontinued = x % 4 == 0,
            FirstReleaseDate = DateTime.Now.AddDays(-x)
        }).ToList();
    }

    public class SampleData
    {
        public int ProductId { get; set; }
        public string ProductName { get; set; }
        public int UnitsInStock { get; set; }
        public decimal Price { get; set; }
        public bool Discontinued { get; set; }
        public DateTime FirstReleaseDate { get; set; }
    }
}

Notes

The CSV export has the following specifics:

  • Column widths are not applied because a CSV document does not have such a concept. You can use any units in the grid itself, they will not be reflected in the exported document. If you need to add such structure, consider exporting to an Excel file.

  • bool fields are exported as TRUE or FALSE strings, because there is no boolean data type in Excel and these string values are the most common ones used in data and macros.

  • Date and number formats are exported with the following format: mm/dd/yyyy hh:mm:ss plus the current app culture AM/PM specifier for dates, and Convert.ToDouble(value) for numbers (which uses the current thread culture). The Excel date formats are different than .NET date formats and Excel may not always recognize the column as dates, for example, if the entire date format from the .NET culture is used.

  • Templates are not exported, because there is no provision in the framework for getting them at runtime. If a column, header or group header/footer has a template or aggregates, it will be ignored. The headers will be the Title of the column, the data is the data from the Field. If you need additional information, see if you can add it in e Field in the model, or create your own excel file (see example here).

  • Only columns that have a Field set are exported.

  • If you are using the OnRead event, only the current page of data will be exported, because that's all the grid has at the time of the export action.

  • With Server-side Blazor, the file may become larger than the default SignalR connection limit, and this can disconnect the client and result in an error. Generally, this requires quite a lot of data to happen, but you may need to increase the size limit of the connection in the ConfigureServices method of your Startup.cs file, for example:

    C#

        services.AddServerSideBlazor().AddHubOptions(o =>
        {
            o.MaximumReceiveMessageSize = 1024 * 1024; // 1MB
        });
    
  • With Client-side Blazor (WebAssembly), all the code runs in the browser and, at the time of writing, is considerably slower than server-side Blazor, and it only has one actual thread. This means that while the file is being generated, the UI will be unresponsive, so you may want to show a loading sign to the user through the OnClick handler of the command button, something like:

    Component

    @* Exporting a lot of rows can be slow in a WebAssembly app more so than in a server-side app, and it blocks the UI *@
    
    <TelerikGrid Data="@GridData" AutoGenerateColumns="true" Pageable="true">
        <GridToolBar>
            <GridCommandButton OnClick="@ShowLoadingSign" Command="ExcelExport" Icon="file-excel">Export to Excel</GridCommandButton>
            <GridCommandButton OnClick="@ShowLoadingSign" Command="CsvExport" Icon="file-csv">Export to CSV</GridCommandButton>
        </GridToolBar>
        <GridExport>
            <GridExcelExport AllPages="true" FileName="telerik-grid-export" />
            <GridCsvExport AllPages="true" FileName="telerik-grid-export" />
        </GridExport>
    </TelerikGrid>
    
    <TelerikWindow Visible="@isExporting" Modal="true">
        <WindowTitle>Please wait...</WindowTitle>
        <WindowContent>We are exporting your data, your file will download shortly.</WindowContent>
    </TelerikWindow>
    
    @code {
        bool isExporting { get; set; }
    
        async Task ShowLoadingSign()
        {
            isExporting = true;
            StateHasChanged();
            // This won't work for server-side Blazor, the UI will render immediately after the delay and the loading sign will only flicker
            await Task.Delay(50);
            isExporting = false;
        }
    
        List<SampleData> GridData { get; set; }
    
        protected override void OnInitialized()
        {
            GridData = Enumerable.Range(1, 1000).Select(x => new SampleData
            {
                ProductId = x,
                ProductName = $"Product {x}",
                UnitsInStock = x * 2,
                Price = 3.14159m * x,
                Discontinued = x % 4 == 0,
                FirstReleaseDate = DateTime.Now.AddDays(-x)
            }).ToList();
        }
    
        public class SampleData
        {
            public int ProductId { get; set; }
            public string ProductName { get; set; }
            public int UnitsInStock { get; set; }
            public decimal Price { get; set; }
            public bool Discontinued { get; set; }
            public DateTime FirstReleaseDate { get; set; }
        }
    }
    

See Also

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