To keep a user logged in to a system until the user explicitly logs out by clicking a logout button, you can use a combination of server-side and client-side techniques in C#. Here are the basic steps:
Implement server-side authentication: When a user logs in, authenticate the user and create an authentication token on the server-side. The authentication token should be associated with the user's session and stored securely on the server.
Implement client-side storage: On the client-side, store the authentication token in a cookie or a session variable. The authentication token should be sent with each request to the server to identify the user.
Implement server-side session management: On the server-side, manage the user's session to keep the user logged in. This can be done by setting a session timeout, refreshing the session timeout with each request, and checking the authentication token on each request.
Implement a logout button: When the user clicks the logout button, delete the authentication token from the server-side session and clear the cookie or session variable on the client-side.
Here's an example of how to implement these steps in ASP.NET Core:
Implement server-side authentication: Use the built-in authentication system in ASP.NET Core to authenticate the user and create an authentication token. This can be done using a variety of authentication schemes, such as cookies, JWT tokens, or OAuth tokens.
Implement client-side storage: Store the authentication token in a cookie or a session variable using JavaScript or a client-side library such as jQuery. Here's an example of how to set a cookie in JavaScript:
document.cookie = "authToken=" + authToken;
services.AddSession(options =>
{
options.IdleTimeout = TimeSpan.FromMinutes(30);
});
To refresh the session timeout with each request, use the UseSession method in the request pipeline:
app.UseSession();
To check the authentication token on each request, use middleware or filters in the request pipeline to validate the token.
document.cookie = "authToken=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/;";
By using a combination of server-side and client-side techniques, you can keep a user logged in to a system until the user explicitly logs out by clicking a logout button.
To parse user credentials from a URL in C#, you can use the Uri class to parse the URL, and then extract the user credentials from the UserInfo property. Here's an example:
string url = "https://username:[email protected]/path"; Uri uri = new Uri(url); string username = uri.UserInfo.Split(':')[0]; string password = uri.UserInfo.Split(':')[1]; Console.WriteLine("Username: " + username); Console.WriteLine("Password: " + password);
In this example, we have a URL string that includes user credentials (username:password). We create a Uri object by passing the URL string to its constructor.
We can then access the UserInfo property of the Uri object, which contains the user credentials. We split the UserInfo string using the colon (:) separator to separate the username and password.
Finally, we can access the extracted username and password values as needed.
Please note that this approach assumes that the user credentials in the URL follow the standard format of username:password. If your URLs have different formats or do not include user credentials, you should handle those cases accordingly.
You can provide a username and password when connecting to a network share in C# by using the NetUseAdd method from the Netapi32.dll library. Here's an example:
using System.Runtime.InteropServices;
class NetworkShare
{
[DllImport("Netapi32.dll", CharSet = CharSet.Unicode)]
private static extern int NetUseAdd(
string UncServerName,
int Level,
ref USE_INFO_2 Buf,
out uint ParmError);
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct USE_INFO_2
{
public string ui2_local;
public string ui2_remote;
public string ui2_password;
public uint ui2_status;
public uint ui2_asg_type;
public uint ui2_refcount;
public uint ui2_usecount;
public string ui2_username;
public string ui2_domainname;
}
public static void ConnectToShare(string sharePath, string username, string password)
{
USE_INFO_2 useInfo = new USE_INFO_2
{
ui2_remote = sharePath,
ui2_username = username,
ui2_password = password,
ui2_asg_type = 0,
ui2_usecount = 1
};
int result = NetUseAdd(null, 2, ref useInfo, out uint paramError);
if (result != 0)
{
// Handle error
}
}
}
In this example, we define a NetworkShare class that uses the NetUseAdd method to connect to a network share. The NetUseAdd method requires a USE_INFO_2 structure that contains information about the network share to connect to, including the remote path, username, and password.
To use the NetUseAdd method, we define a USE_INFO_2 structure and fill it with the necessary information, including the ui2_remote path of the network share, the ui2_username and ui2_password of the user, and the ui2_asg_type and ui2_usecount parameters. We then call the NetUseAdd method with this information to connect to the network share.
Note that you should be careful when passing the password as a parameter, as it can be a security risk. You may want to consider using secure storage options like CredentialManager to securely store and retrieve user credentials.
To set a DateTimePicker control to display only the month and year, you can set the Format property of the control to DateTimePickerFormat.Custom and the CustomFormat property to "MM/yyyy" or another format that displays only the month and year.
Here's an example of how to set the DateTimePicker control to display only the month and year in C#:
dateTimePicker1.Format = DateTimePickerFormat.Custom; dateTimePicker1.CustomFormat = "MM/yyyy";
In this example, the Format property is set to DateTimePickerFormat.Custom to allow a custom format to be used.
The CustomFormat property is set to "MM/yyyy" to display only the month and year. You can change the format string to another value that displays only the month and year, such as "MMM yyyy" for a format like "Jan 2022".
Note that while the DateTimePicker control will only display the month and year, the Value property will still contain the full date and time information. You may need to adjust the Value property in your code to only use the month and year portion of the DateTime object.