Csvhelper write array to csv

Lot of applications want to export data in a CSV file. We will also see how to automatically download the file instead of just showing it in the browser or giving the user a link to download it. Make sure the location in which you are saving this file is writeable by your server Line 5 is to add the column headers.

Csvhelper write array to csv

Exporting your data to CSV format Introduction On-line web applications providing some business functionality often need to exchange data between other applications. For example, data displayed in a DataGrid might be needed by an Excel spreadsheet or data might be needed to be put inside Outlook address book.

In this article we will see how to write a generic routine so that your entire DataTable can be exported to CSV format.

csvhelper write array to csv

The scenario As an example we will consider following scenario: You have a web application that stores customer information such as name, contact person and country. You want to provide an export facility for this data so that you can download a CSV file containing this data at a click of a button.

As you might have guessed we will be using the Customers table of Northwind database for our example. Following code illustrates this subroutine: We store this DataSet in a session variable for later user. Finally, we bind the DataGrid with this DataSet.

The class will have a public function called Export with following signature: Following code illustrates the complete Export function: Length - 1 If arr i.

If we want to export the column headings then we iterate through the columns collection of the DataTable and retrieve the column names. We store the column headings as a comma separated string in a variable called header Note that the column headings are enclosed in double quotes "".

We then iterate through each row of the DataTable We get an array of all the column values using ItemArray property of the DataRow class. This property returns an object array of all the values from a given row. We then iterate through this array and create a comma separated string consisting of column values Note that it is possible that our column values can contain comma themselves.

We enclose such values in double quotes "".


We store this comma separated list into a variable called record. We keep on appending this record variable to another variable called body. Finally, we return header and body if column headings are to be exported else we simply return the body. Write following code in the click event handler of the "Export to CSV" button.

We convert this string into a byte array for later use. Text namespace We then clear the response buffer by calling Response. These headers will decide the application that is supposed to deal with the data being sent and default file name for the file being downloaded.

I have used Excel here because people often use it to work with CSV files. This method will write our data to the response stream in raw format. Note that BinaryWrite method expects byte array as the input and that is why we converted the exported data in byte array form previously.

Now, run the web form, check the checkbox if you want to export column headings and click on the "Export to CSV" button. You should be prompted for downloading the CSV file. The default name for the file will be customers.Step 3A: CSV to JSON.

Create a new function with a trigger of type “External File Trigger”. I chose Dropbox as my input and blob storage as my output, using the same “{name}” token in both names so that my incoming CSV file will generate a matching named JSON file in my output.

Lastly, write some code to convert the CSV to JSON. Home > Code Samples > Convert XML to CSV in C# XML to CSV XmlRecordReader allows you to specify an XPath to loop over any size XML file, and then use additional XPaths to specify nodes and attributes that can then be referenced by name.

The example Read a CSV file into an array in C# shows how to load a CSV file into a two-dimensional array of strings. This example does the opposite: it saves a two-dimensional array of strings into a CSV (comma-separated value) file. When you click the program’s Write button, the following code builds a two-dimensional array of data and uses it to write a CSV file.

I would like to use the csvhelper to export a list of objects to a csv file in the browser. All I see in the documentation are ways to write directly to a file - can you return the csv file as a string for export? A reader that provides fast, non-cached, forward-only access to CSV data.

Oct 20,  · C# export / write multidimension array to file (csv or whatever) Archived Forums V > Visual C# Express Edition. Hi Designing a program and i just wanted advise on writing a multiDim array to a file. I am using XNA and have a multidimension array with a Vector3(x, y, z)'s in it.

c# - Reading CSV file and storing values into an array - Stack Overflow