How to Execute Nested Group Mail Merge with JSON in ASP.NET Core Word?

Syncfusion; Essential; DocIO is a .NET Word library used to create, read, edit, and convert Word documents programmatically without Microsoft Word or interop dependencies. Using this library, you can execute nested group mail merge with JSON in Word document using C#.

1. Create a new .NET Core console application project.
   
   
2. Install the Syncfusion.DocIO.Net.Core NuGet package as a reference to your project from NuGet.org.
   
   

3. Include the following namespaces in Program.cs file
   C#

using Newtonsoft.Json.Linq;
using Syncfusion.DocIO;
using Syncfusion.DocIO.DLS;
using System.Collections.Generic; 

4. Use the following code example to execute nested group mail merge with JSON in Word document.
   C#

using (FileStream fileStream = new FileStream(Path.GetFullPath(@"Data/Template.docx"), FileMode.Open, FileAccess.ReadWrite))
{
   //Open the template document.
   using (WordDocument document = new WordDocument(fileStream, FormatType.Docx))
   {
       //Get the Json data details as DataTable.
       List<object> jsonData = GetJsonData();
       //Creates the mail merge data table in order to perform mail merge.
       MailMergeDataTable dataTable = new MailMergeDataTable("Organizations", jsonData);
       // Perform mail merge with the prepared data table.
       document.MailMerge.ExecuteNestedGroup(dataTable);
       //Create file stream.
       using (FileStream outputStream = new FileStream(Path.GetFullPath(@"Output/Result.docx"), FileMode.Create, FileAccess.ReadWrite))
       {
           //Save the Word document to file stream.
           document.Save(outputStream, FormatType.Docx);
       }
   }
}

5. Use the following code example to prepares the data table from JSON data for processing.
   C#

private static List<object> GetJsonData()
{
   //Reads the JSON object from JSON file.
   JObject jsonObject = JObject.Parse(File.ReadAllText(Path.GetFullPath(@"Data/Data.json")));
   //Converts JSON object to Dictionary.
   IDictionary<string, object> data = GetData(jsonObject);
   return data["Organizations"] as List<object>;
}

6. Use the following code example to gets data from JSON object.
   C#

 private static IDictionary<string, object> GetData(JObject jsonObject)
{
    Dictionary<string, object> dictionary = new Dictionary<string, object>();
    foreach (var item in jsonObject)
    {
        object keyValue = null;
        if (item.Value is JArray)
            keyValue = GetData((JArray)item.Value);
        else if (item.Value is JToken)
            keyValue = ((JToken)item.Value).ToObject<string>();
        dictionary.Add(item.Key, keyValue);
    }
    return dictionary;
}

7. Use the following code example to gets array of items from JSON array.
   C#

private static List<object> GetData(JArray jArray)
{
   List<object> jArrayItems = new List<object>();
   foreach (var item in jArray)
   {
       object keyValue = null;
       if (item is JObject)
           keyValue = GetData((JObject)item);
       jArrayItems.Add(keyValue);
   }
   return jArrayItems;
}

You can download a complete working sample to execute nested group mail merge with JSON in Word document from the GitHub.

Take a moment to peruse the documentation where you can find basic Word document processing options along with the features like mail merge, merge, split, and compare Word documents, find and replace text in the Word document, protect the Word documents, and most importantly, the PDF and Image conversions with code examples.

Conclusion

I hope you enjoyed learning about how to execute nested group mail merge with JSON in ASP.NET Core Word.

You can refer to our ASP.NET Core DocIO feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our ASP.NET Core DocIO example to understand how to create and manipulate data.

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