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Imagine that we wanted toWorking with very large

The last step is to choose the name for the new method. Actualice la consulta para devolver el BrochurePath y haga clic en Finalizar.

For instance, the HasFile property indicates whether a file was uploaded by the user, while the FileBytes property provides access to the uploaded binary data as an array of bytes. There are a number of techniques for resolving file name conflicts. Instead, let s update the main TableAdapter query to bring back BrochurePath and create an additional data retrieval method that returns a particular category s Picture column. In this step we'll look at how to allow a user to upload files from their computer to the server. There are several subtleties that must be addressed when saving uploading files to the web server s file system.

Imagine that we wanted to extend the Northwind database to associate a picture with each product. Por lo tanto, agrega este Control de usuario a Default. On postback, the uploaded file can be saved to the file system or its binary data can be worked with directly through a Stream. Working with very large amounts of binary data files that are several megabytes or larger introduces new challenges that are beyond the scope of these tutorials.

With the code we haveOne option is to

One option is to prohibit uploading a file if there already exists one with the same name. With the code we have now, User A s file will be overwritten with User B s upload. After uploading the image file, we d update the Chai record in the Products table so that its ImagePath column referenced the path of the new image. Por ejemplo, el HasFile propiedad indica si se ha cargado un archivo por el usuario, mientras que el FileBytes propiedad proporciona acceso a los datos binarios cargados como una matriz de bytes. Like in the other folders, Default.

We could have both of these column values returned in the main TableAdapter query, but this would bring back the binary data every time the GetCategories method was invoked. The menu on the left now includes items for the Working with Binary Data tutorials. One option would be to store these image files on the web server s file system and record the path in the Products table. Therefore, add this User Control to Default. In order to work with the Picture and BrochurePath properties, we need to first add them to the CategoriesDataTable and then update the CategoriesTableAdapter class to return these columns.

These tutorials assume that the binary data captured is modest in size. Para demostrar la carga de archivos, abra el FileUpload. We must write extra code to delete the file or the file system will become cluttered with unused, orphaned files. Ampliar el acceso a los datos binarios los datos binarios que deba ser accesible para otros servicios o aplicaciones, las que no se extraen los datos de la base de datos.

Por lo tanto

There are also more subtle benefits of storing the binary data in the database. In the next tutorial we'll explore these options in more detail. This brings up the Table Adapter Configuration Wizard, which we ve seen in a number of past tutorials.

On postback the uploaded file