ASPxSpreadsheet.Open(String, Func<Byte[]>) Method

Opens a document from an array of bytes.

Namespace: DevExpress.Web.ASPxSpreadsheet

Assembly: DevExpress.Web.ASPxSpreadsheet.v24.2.dll

Declaration

C#

public void Open(
    string documentId,
    Func<byte[]> contentAccessorByBytes
)

VB.NET

Public Sub Open(
    documentId As String,
    contentAccessorByBytes As Func(Of Byte())
)

Parameters

Name	Type	Description
documentId	String	The document identifier. This value is assigned to the DocumentId property.
contentAccessorByBytes	Func<Byte[]>	A method delegate to obtain a byte array from which to open the document.

Remarks

Call this Open method to load a document from an array of bytes. Specify the documentId parameter to identify the document. If the specified value is not unique within all open documents, the method activates the previously loaded document with the same documentId and ignores the array of bytes.

C#

C#
private void CustomDocumentOpening() {
    var uniqueDocumentId = GetUniqueDocumentId();

    // Open a document from a byte array 
    byte[] documentContentAsByteArray = GetByteArrayFromCustomDocumentStorage();
    using (var stream = GetStreamFromCustomDocumentStorage()) {
        ASPxSpreadsheet1.Open(uniqueDocumentId, () => documentContentAsByteArray);
    }
}

private string GetUniqueDocumentId() {
    throw new NotImplementedException();
    // Obtain a previously saved DocumentId (for instance, from a database, if you have previously saved it there): 
    // return GetDocumentIdFromDatabase(); 
    // or 
    // Create a new unique identifier: 
    // return Guid.NewGuid().ToString(); 
}


private byte[] GetByteArrayFromCustomDocumentStorage() {
    throw new NotImplementedException();
    // Provide your custom logic to obtain a document (for instance, from a database) 
}

This overload of the Open method determines a document’s format automatically, however this process reduces the method’s performance. Use the Open(String, DocumentFormat, Func<Byte[]>) overload to improve the method performance.

Note

We recommend that you do not use the LoadDocument method to open a document. When you call this method, the ASPxSpreadsheet does not receive information about the opened document and cannot work with it correctly.