DotNet 学习笔记 应用状态管理
Application State Options
---------------------------------------------------------------------
*HttpContext.Items
app.Use(async (context, next) =>
{
// perform some verification
context.Items["isVerified"] = true;
await next.Invoke();
}); app.Run(async (context) =>
{
await context.Response.WriteAsync("Verified request? " + context.Items["isVerified"]);
});
----------------------------------------------------------------------
*QueryString and Post
----------------------------------------------------------------------
*Cookies
----------------------------------------------------------------------
*Session
Microsoft.AspNetCore.Session
Microsoft.Extensions.Caching.Memory services.AddDistributedMemoryCache();
services.AddSession(); app.UseSession(); services.AddSession(options =>
{
options.CookieName = ".AdventureWorks.Session";
options.IdleTimeout = TimeSpan.FromSeconds();
}); {
services.AddDistributedMemoryCache(); services.AddSession(options =>
{
options.IdleTimeout = TimeSpan.FromSeconds();
});
} // main catchall middleware
app.Run(async context =>
{
RequestEntryCollection collection = GetOrCreateEntries(context); if (collection.TotalCount() == )
{
await context.Response.WriteAsync("<html><body>");
await context.Response.WriteAsync("Your session has not been established.<br>");
await context.Response.WriteAsync(DateTime.Now.ToString() + "<br>");
await context.Response.WriteAsync("<a href=\"/session\">Establish session</a>.<br>");
}
else
{
collection.RecordRequest(context.Request.PathBase + context.Request.Path);
SaveEntries(context, collection); // Note: it's best to consistently perform all session access before writing anything to response
await context.Response.WriteAsync("<html><body>");
await context.Response.WriteAsync("Session Established At: " + context.Session.GetString("StartTime") + "<br>");
foreach (var entry in collection.Entries)
{
await context.Response.WriteAsync("Request: " + entry.Path + " was requested " + entry.Count + " times.<br />");
} await context.Response.WriteAsync("Your session was located, you've visited the site this many times: " + collection.TotalCount() + "<br />");
}
await context.Response.WriteAsync("<a href=\"/untracked\">Visit untracked part of application</a>.<br>");
await context.Response.WriteAsync("</body></html>");
}); public class RequestEntry
{
public string Path { get; set; }
public int Count { get; set; }
}
public class RequestEntryCollection
{
public List<RequestEntry> Entries { get; set; } = new List<RequestEntry>(); public void RecordRequest(string requestPath)
{
var existingEntry = Entries.FirstOrDefault(e => e.Path == requestPath);
if (existingEntry != null) { existingEntry.Count++; return; } var newEntry = new RequestEntry()
{
Path = requestPath,
Count =
};
Entries.Add(newEntry);
} public int TotalCount()
{
return Entries.Sum(e => e.Count);
}
} private RequestEntryCollection GetOrCreateEntries(HttpContext context)
{
RequestEntryCollection collection = null;
byte[] requestEntriesBytes = context.Session.Get("RequestEntries"); if (requestEntriesBytes != null && requestEntriesBytes.Length > )
{
string json = System.Text.Encoding.UTF8.GetString(requestEntriesBytes);
return JsonConvert.DeserializeObject<RequestEntryCollection>(json);
}
if (collection == null)
{
collection = new RequestEntryCollection();
}
return collection;
} // establish session
app.Map("/session", subApp =>
{
subApp.Run(async context =>
{
// uncomment the following line and delete session coookie to generate an error due to session access after response has begun
// await context.Response.WriteAsync("some content");
RequestEntryCollection collection = GetOrCreateEntries(context);
collection.RecordRequest(context.Request.PathBase + context.Request.Path);
SaveEntries(context, collection);
if (context.Session.GetString("StartTime") == null)
{
context.Session.SetString("StartTime", DateTime.Now.ToString());
} await context.Response.WriteAsync("<html><body>");
await context.Response.WriteAsync($"Counting: You have made {collection.TotalCount()} requests to this application.<br><a href=\"/\">Return</a>");
await context.Response.WriteAsync("</body></html>");
});
}); private void SaveEntries(HttpContext context, RequestEntryCollection collection)
{
string json = JsonConvert.SerializeObject(collection);
byte[] serializedResult = System.Text.Encoding.UTF8.GetBytes(json); context.Session.Set("RequestEntries", serializedResult);
} // example middleware that does not reference session at all and is configured before app.UseSession()
app.Map("/untracked", subApp =>
{
subApp.Run(async context =>
{
await context.Response.WriteAsync("<html><body>");
await context.Response.WriteAsync("Requested at: " + DateTime.Now.ToString("hh:mm:ss.ffff") + "<br>");
await context.Response.WriteAsync("This part of the application isn't referencing Session...<br><a href=\"/\">Return</a>");
await context.Response.WriteAsync("</body></html>");
});
}); app.UseSession();
----------------------------------------------------------------------
*Cache
-------------------------------------------------------------------
*Configuration
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