Struggling with Excel in .NET 8 Blazor?🚀Learn how to Effectively Read & Display Excel File in Blazor Application🌟

Reading Excel Files in a Blazor App

This Blazor component allows users to upload and read Excel files, displaying the contents in an HTML table. It leverages the EPPlus library for reading Excel files and incorporates a custom file upload component from NetcodeHub.

Key Features

File Upload Component

• The component integrates NetcodeHubFileUpload, a custom file upload component designed to handle file uploads in Blazor applications.
• It is configured to accept only .xlsx files by setting the RequiredExtensions property to [".xlsx"].
• The Multiple property is set to false, restricting the upload to a single file at a time.
• The ShowDisplay property is set to true, which likely displays a progress bar or some visual indicator during the upload process.
• The Notify event is hooked to a method called RetrieveFiles, which processes the uploaded file.

Error Display

Any errors encountered during the file upload or processing are displayed prominently at the top of the page within an <h1> element.

Excel Data Display

• The uploaded Excel data is presented in a responsive and interactive HTML table.
• The table has predefined headers for "Product," "Customer," and quarterly data ("Qtr 1," "Qtr 2," "Qtr 3," "Qtr 4").
• The table dynamically renders rows and cells based on the contents of the uploaded Excel file.

File Processing Logic

• The RetrieveFiles method is called when a file is uploaded. It checks if a file has been uploaded and then calls ReadExcelFile to process it.
• The ReadExcelFile method is responsible for reading the uploaded Excel file using the EPPlus library. It opens the file, reads its contents, and stores the data in a two-dimensional list (excelData).

Dynamic Data Rendering

• The component uses the data stored in excelData to dynamically generate the table rows and cells.
• It skips the first row (which often contains headers) and iterates through the remaining rows to populate the table.
• Each cell in the table corresponds to a cell in the Excel file, ensuring the displayed data accurately reflects the uploaded content.

Workflow

File Upload

The user uploads an Excel file using the NetcodeHubFileUpload component. The component validates the file extension and shows the upload progress.

File Processing

Once the file is uploaded, the RetrieveFiles method is invoked. This method calls ReadExcelFile, which uses EPPlus to read the Excel file's content. The content is read into a memory stream, and EPPlus processes this stream to extract data from the first worksheet. The extracted data is stored in excelData, a list of lists representing rows and columns of the Excel file.

Data Display

The component renders the extracted data in an HTML table. If there are any errors during the upload or processing, they are displayed to the user.

User Interaction

Users can see the uploaded data displayed in a structured format. Any issues encountered during the process are clearly communicated through the error message display.

Summary

This Blazor component provides a seamless way to upload, read, and display Excel data, making it a powerful tool for applications that require dynamic data presentation from Excel files. The use of EPPlus ensures robust and efficient handling of Excel files, while the custom file upload component from NetcodeHub simplifies the file upload process.