WorkbookBase.EncryptionProvider Property

Gets the name of the algorithm encryption provider that Microsoft Office Excel uses when encrypting passwords for the workbook.

Namespace:  Microsoft.Office.Tools.Excel
Assembly:  Microsoft.Office.Tools.Excel.v4.0.Utilities (in Microsoft.Office.Tools.Excel.v4.0.Utilities.dll)

Syntax

'Declaration
Public Property EncryptionProvider As String
    Get
    Set

public string EncryptionProvider { get; set; }

Property Value

Type: System.String
The name of the algorithm encryption provider that Excel uses when encrypting passwords for the workbook.

Examples

The following code example checks the value of the HasPassword property to determine whether the workbook is password protected. If the workbook is not password protected, then the example sets the Password property to a password obtained from user input, and then calls the SetPasswordEncryptionOptions method to set the encryption algorithm, set the key length, set the name of the encryption provider, and enable file property encryption. The example then displays the values of the PasswordEncryptionProvider, PasswordEncryptionAlgorithm, PasswordEncryptionKeyLength, and PasswordEncryptionFileProperties properties in worksheet Sheet1. This example assumes that the method GetPasswordFromUserInput is defined elsewhere.

This example is for a document-level customization.

Private Sub WorkbookPasswordOptions()
    If Not Me.HasPassword Then
        Me.Password = GetPasswordFromUserInput()
        Me.SetPasswordEncryptionOptions( _
            "Microsoft RSA SChannel Cryptographic Provider", _
            "RC4", 128, True)
    End If

    ' Display the password properties in Sheet1.
    Globals.Sheet1.Range("A1").Value2 = _
        "Password Encryption Provider:"
    Globals.Sheet1.Range("A2").Value2 = _
        "Password Encryption Algorithm:"
    Globals.Sheet1.Range("A3").Value2 = _
        "Password Encryption Key Length:"
    Globals.Sheet1.Range("A4").Value2 = _
        "Password Encryption File Properties:"
    Globals.Sheet1.Range("A1", "A4").Columns.AutoFit()

    Globals.Sheet1.Range("B1").Value2 = _
        Me.PasswordEncryptionProvider
    Globals.Sheet1.Range("B2").Value2 = _
        Me.PasswordEncryptionAlgorithm
    Globals.Sheet1.Range("B3").Value2 = _
        Me.PasswordEncryptionKeyLength
    Globals.Sheet1.Range("B4").Value2 = _
        Me.PasswordEncryptionFileProperties
    Globals.Sheet1.Range("B1", "B4").Columns.AutoFit()
End Sub

private void WorkbookPasswordOptions()
{
    if (!this.HasPassword)
    {
        this.Password = GetPasswordFromUserInput();
        this.SetPasswordEncryptionOptions(
            "Microsoft RSA SChannel Cryptographic Provider",
            "RC4", 128, true);
    }

    // Display the password properties in Sheet1.
    Globals.Sheet1.Range["A1", missing].Value2 =
        "Password Encryption Provider:";
    Globals.Sheet1.Range["A2", missing].Value2 =
        "Password Encryption Algorithm:";
    Globals.Sheet1.Range["A3", missing].Value2 =
        "Password Encryption Key Length:";
    Globals.Sheet1.Range["A4", missing].Value2 =
        "Password Encryption File Properties:";
    Globals.Sheet1.Range["A1", "A4"].Columns.AutoFit();

    Globals.Sheet1.Range["B1", missing].Value2 =
        this.PasswordEncryptionProvider;
    Globals.Sheet1.Range["B2", missing].Value2 =
        this.PasswordEncryptionAlgorithm;
    Globals.Sheet1.Range["B3", missing].Value2 =
        this.PasswordEncryptionKeyLength;
    Globals.Sheet1.Range["B4", missing].Value2 =
        this.PasswordEncryptionFileProperties;
    Globals.Sheet1.Range["B1", "B4"].Columns.AutoFit();
}

.NET Framework Security

• Full trust for the immediate caller. This member cannot be used by partially trusted code. For more information, see Using Libraries from Partially Trusted Code.

See Also

Reference

WorkbookBase Class

Microsoft.Office.Tools.Excel Namespace