How to check if the current user has rights to read a file in .NET
I could not find any function in .NET that just straight out does this. Furthermore I could not find any code on the web that explained what would be the best way to go about it. Finally I found some code here:
(post is no longer there)
that checks if you could write to a file and I modified it to check if you could read:
(post is no longer there)
that checks if you could write to a file and I modified it to check if you could read:
Public Shared Function CanReadFile(ByVal fileNameWithPath As String) As Boolean Dim currentUser As System.Security.Principal.WindowsIdentity = System.Security.Principal.WindowsIdentity.GetCurrent() Dim currentPrinciple As System.Security.Principal.WindowsPrincipal = System.Threading.Thread.CurrentPrincipal Dim acl As System.Security.AccessControl.AuthorizationRuleCollection = System.IO.File.GetAccessControl(fileNameWithPath).GetAccessRules(True, True, GetType(System.Security.Principal.SecurityIdentifier)) Dim denyread As Boolean = False Dim allowread As Boolean = False For Each currentRule As System.Security.AccessControl.FileSystemAccessRule In acl If currentUser.User.Equals(currentRule.IdentityReference) Or currentPrinciple.IsInRole(currentRule.IdentityReference) Then If currentRule.FileSystemRights = System.Security.AccessControl.FileSystemRights.Read Then If currentRule.AccessControlType.Equals(System.Security.AccessControl.AccessControlType.Deny) Then denyread = True ElseIf currentRule.AccessControlType.Equals(AccessControlType.Allow) Then allowread = True End If End If End If Next If allowread And Not (denyread) Then Return True Else Return False End If End Function
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