Read write office 365 document in asp net

Introduction

ASP.NET is a popular programming language used for web applications. In this article, we will explore how to read and write Office 365 documents using ASP.NET. We will provide examples to demonstrate the process.

Reading Office 365 Documents

To read Office 365 documents in ASP.NET, we can use the Microsoft Graph API. This API allows us to access various Microsoft services, including Office 365. Here is an of how to read a Word :


using Microsoft.Graph;
using System.IO;

  Task ReadWordDocument(string documentId)
{
    var graphClient = new GraphServiceClient();
    var  = await graphClient.Me.Drive.Items[documentId].Content.Request().GetAsync();
    
    using (var reader = new StreamReader(stream))
    {
        return reader.ReadToEnd();
    }
}

In the above example, we first create an instance of the GraphServiceClient class, which allows us to interact with the Microsoft Graph API. We then use the client to retrieve the content of the document using its ID. Finally, we read the content of the document using a StreamReader and return it as a string.

Writing Office 365 Documents

To write Office 365 documents in ASP.NET, we can use the Microsoft Graph API. Here is an example of how to create a new Word document:


using Microsoft.Graph;
using System.IO;

public async Task CreateWordDocument(string documentName, string content)
{
    var graphClient = new GraphServiceClient();
    var driveItem = new DriveItem
    {
        Name = documentName,
        File = new Microsoft.Graph.File(),
        AdditionalData = new Dictionary
        {
            { "@microsoft.graph.conflictBehavior", "rename" }
        }
    };
    
    using (var stream = new MemoryStream(Encoding.UTF8.GetBytes(content)))
    {
        await graphClient.Me.Drive.Root.Children.Request().AddAsync(driveItem, stream);
    }
    
    return driveItem.Id;
}

In the above example, we create a new instance of the DriveItem class and set its , such as the document name and conflict behavior. We then convert the content string into a MemoryStream and use the GraphServiceClient to add the document to the user's drive. Finally, we return the ID of the newly created document.

Conclusion

ASP.NET provides powerful capabilities for reading and writing Office 365 documents. By leveraging the Microsoft Graph API, developers can easily integrate Office 365 functionality into their ASP.NET applications. The examples provided in this article demonstrate the basic process of reading and writing Word documents, but similar can be used for other Office 365 document types as well.

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