Setting up the Template

About templates and data markers

An ExcelTemplate ExcelWriter template is an Excel file that contains ExcelWriter data markers. A datamarker data marker is a cell value beginning with %%= that specifies a database columcolumn, variable, or array to insert into the spreadsheet column. Data markers are added to a worksheet in Excel and then bound to data sources in code. ExcelWriter populates the data markers with values from the data sources when the code is executed.

Datamarker Data marker syntax

The basic syntax for a datamarker data marker is %%=[DataSourceName].[ColumnName], where DataSourceName is the name of the data source and ColumnName is the name of the column of data in the data source. You need to follow these rules when naming data markers:

• Names MUST must begin with a letter (A-Z, a-z)
• Spaces and Unicode characters are NOT allowed unless the names are inside The brackets (%%=[Data Source Name].ColumnName, %%=DataSourceName.[Column$Name]) ]) are optional, but must be used when the data marker contains spaces or Unicode characters
  • The following is a list of characters allowed in data marker names without brackets: ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890_
• Names must exactly match the names in the data source exactly.
  • If a column in a database is 'Street Address', the ColumnName must be [Street Address] to account for the space. Similarly, if a data source name is "DataSource1", the data marker name must be DataSource1 or [DataSource1].

For more specific information about creating data markers, see Creating Data Markers

Adding data markers to the the template

The final template will look something like this:

1. Start with a blank xlsx file. Save the file as template.xlsx.

2. Add some text placeholders for data markers and table headers. In the header Note: At the top of the worksheet, we will display the fiscal year, the company division and group. Below will be 2 tables: one to show the top 5 expenses and another to show all the expenses.

In the screen shot, Fiscal Year, Division, and Group will replaced by data markers. Top Expenses, All Expenses, Description, and Expenses are going to become table headers. The data markers for that data will go in the rows below.

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...

1. Start with a blank .xlsx file. Save the file as template.xlsx.

2. Add some data markers for Replace Fiscal Year, Division, and Group with data markers. These values are going to will be a single row of a data set called "Header". The column names will be "FiscalYear", "Division" and "Group".

43. Next add data markers for Top Expenses and All Expenses, which will be table header columns:

• The data set source name for Top Expenses will be "Top 5 Expenses" with column names "Description" and "Expenses".
• The data set source name for All Expenses will be "All Expenses" with the same column names.
• Since the data source names have spaces, the data markers need to be in brackets.

...

We're done adding the data markers, so next we'll add some styles and formatting to the data markers.

Formatting cells with data markers

5. In the screen shot we have made the %%=Header.FiscalYear cell font size 18, %%=Header.Division is bold, and %%=Header.Group is italic.

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6. Since 'Expenses' will be currency values, add a currency number formatting to the cells containing the Expenses data markers. This number formatting will be repeated for row of data that is inserted.

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7. Add some borders to the cells in the Top Expenses and All Expenses tables. Then format the table headers as desired. Below is a screen shot of the final image:

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We're done creating the template. Now it's time to write the code. hook the template up to some data before we do any formatting.

Adding an ExcelWriter Reference in Visual Studio

Create a .NET project and add a reference to the ExcelWriter library.

1. Open Visual Studio and create a .NET project.
   • The sample code uses a web application.
2. Add a reference to SoftArtisans.OfficeWriter.ExcelWriter.dll
   • SoftArtisans.OfficeWriter.ExcelWriter.dll is located under Program Files > SoftArtisans > OfficeWriter > dotnet > bin

Writing the Code

1. Include the SoftArtisans.OfficeWriter.ExcelWriter namespace in the code behind

using SoftArtisans.OfficeWriter.ExcelWriter;

2. In the method that is going to will actually run the report, instantiate the ExcelTemplate object.

ExcelTemplate XLT = new ExcelTemplate();

3. Open the template file from earlier with the ExcelTemplate.Open method.

XLT.Open(Page.MapPath("//templates//part1_template.xlsx"));

4. Create a DataBindingProperties object. Although we won't be changing any of the binding properties, a DataBindingProperties is a required parameter in all ExcelTemplate data binding methods.

DataBindingProperties dataProps = XLT.CreateDataBindingProperties();

5. Create a an object array for the header values and a string array for the column names.

ExcelTemplate can be bound to numerous types of .NET data structures: single variables, arrays (1-D, jagged, multi-dimensional), DataSet, DataTable, IDataReader etc. The source of the data can come from anywhere.

Some of the aforementioned structures have built in column names, such as the DataTable. When working with arrays, which don't have built in column names, you have to define the column names in a separate string array.

//This report is for FiscalYear: FY 2004, Division: Canadian Division, Group: Research and Development
object[] valuesArray = { "FY 2004", "Canadian Division", "Research and Development" };

//The column names are FiscalYear, Division, Group
string[] columnNamesArray = { "FiscalYear", "Division", "Group" };

6. Use the ExcelTemplate.BindRowData method to bind the header data to the data markers in the template file (%%=Header.FiscalYear, %%=Header.Division, %%=Header.Group).

BindRowData() binds a single row of data to the template, but the data markers in the template do not need to be in a single row.

XLT.BindRowData(valuesArray, columnNamesArray, "Header", dataProps);

7. Get the data for the Top 5 Expenses and All Expenses data sets.In this case, we chose to parse CSV files that contained query results from the AdventureWorks2008 database.

These calls are to a helper method GetCSVData that parses the CSV files and returns a DataTable with the values.

DataTable dtTop5 = GetCSVData(Page.MapPath("//data//Part1_Top5Expenses.csv"));
DataTable dtAll = GetCSVData(Page.MapPath("//data//Part1_AllExpenses.csv"));

If you are following in your own project and would like to parse the CSV files as well, you will need to:

• Add a reference to GenericParsing.dll
• Include GeneringParsing at the top of your code.
• Add the GetCSVData method that can be found in the sample code.

8. Use ExcelTemplate.BindData to bind the data for the Top 5 Expenses and All Expenses data sets.

Recall that the data source names ([Top 5 Expenses], [All Expenses]) need to match the data marker names exactly.

XLT.BindData(dtTop5, "Top 5 Expenses", dataProps);
XLT.BindData(dtAll, "All Expenses", dataProps);

9. Call ExcelTemplate.Process() to import the data into the file.

XLT.Process();

10. Call ExcelTemplate.Save to save the output file.

ExcelTemplate has several output options: save to disk, save to a stream, stream the output file in a page's Response inline or as an attachment.

XLT.Save(Page.Response, "Part1_Output.xlsx", false);

11. Run your code.

Here is an example of the output from the sample code:

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Formatting cells with data markers

1. In the screen shot below we have made the %%=Header.FiscalYear cell font size 18, %%=Header.Division is bold, and %%=Header.Group is italic.

Image Added

2. Since the 'Expenses' data will be currency values, add a currency number formatting to the cells containing the Expenses data markers. This number formatting will be repeated for each row of data that is inserted.

Image Added

3. Add some borders to the cells in the Top Expenses and All Expenses tables. Then format the column headers as desired. Below is a screen shot of the final template:

Image Added

4. Run the code with the updated template file. Here's a screenshot of the output with all the formatting applied:

Note: The formatting has been applied to the values that replaced the data markers, including the data sets with multiple rows. Also note that the Top 5 Expenses and All Expenses tables have expanded to accomodate accommodate the new rows of data (i.e. All Expenses was pushed down when the Top 5 Expenses data was imported).

Final Code

using SoftArtisans.OfficeWriter.ExcelWriter;
...
ExcelTemplate XLT = new ExcelTemplate();

XLT.Open(Page.MapPath("//templates//part1_template.xlsx"));

DataBindingProperties dataProps = XLT.CreateDataBindingProperties();

object[] valuesArray = { "FY 2004", "Canadian Division", "Research and Development" };
string[] columnNamesArray = { "FiscalYear", "Division", "Group" };

XLT.BindRowData(valuesArray, columnNamesArray, "Header", dataProps);

DataTable dtTop5 = GetCSVData(Page.MapPath("//data//Part1_Top5Expenses.csv"));
DataTable dtAll = GetCSVData(Page.MapPath("//data//Part1_AllExpenses.csv"));

XLT.BindData(dtTop5, "Top 5 Expenses", dataProps);
XLT.BindData(dtAll, "All Expenses", dataProps);

XLT.Process();

XLT.Save(Page.Response, "Part1_Output.xlsx", false);

Downloads

You can download the code for the Basic ExcelWriter Tutorials as a Visual Studio solution, which includes the Simple Expense Summary.

• OfficeWriter-Basics-csharpExcelWriter_Basic_Tutorials.zip

Next Steps

Continue on to Part 2: Working with Formulas