Question

我具有以下用于设置“个人资料”页面的代码

public partial class profile : System.Web.UI.Page
{
protected Profile _profile;
protected List<Purchase> _purchases;

protected void Page_Load(object sender, EventArgs e)
{
    ProfileHelper.IncrementActiveRequests();
    try
    {
        var username = Context.Request.QueryString["username"];
        if (String.IsNullOrEmpty(username))
        {
            throw new ArgumentException("Missing required parameter: username");
        } 
        else 
        {
        _profile = ProfileHelper.GetProfile(username);

        // Extract the purchases
        _purchases = _profile.Purchases;
        }
    }
    catch
    {
        throw new ArgumentException("Couldn't retreive");
    }
    finally
    {
        ProfileHelper.DecrementActiveRequests();
    }
}

}

哪个设置-

<%@ Page Language="C#" AutoEventWireup="true"    CodeFile="profile.aspx.cs" Inherits="profile" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
    <h1>Profile for user: <%= _profile.Username %></h1>
    <h2>Purchases</h2>
    <% foreach (var purchase in _purchases) { %>
        <h3><%= purchase.Id %>: <%= purchase.Quantity %> items at $<%= Math.Round(purchase.Price / 100.0) %>.</h3>            
    <% } %>
</div>
</form>

我遇到的问题是，该信息不断引发HTTP 500错误-

有没有办法可以捕获此错误？我尝试添加一个try catch函数，但这似乎并没有解决问题。

我的getProfile方法如下所示-

public static Profile GetProfile(string username)
{
    // We cache the profile for 1 minute so we can speed up access, but still return fairly fresh profiles

    // lock for thread safety
     Profile profile = null;
     lock (s_profileCache)
    {
        if (!s_profileCache.TryGetValue(username, out profile)
            || profile.CreateTime < DateTime.UtcNow.AddMinutes(-1))
        {
            // missing or stale, fetch it
            profile = RetrieveProfile(username);

            if(profile != null)
            {
            // save it in the cache
            s_profileCache[username] = profile;

            // Store purchases in purchase cache, if not already present (puchases don't change
            // so probably no point overwriting them?)
            foreach (var p in profile.Purchases)
            {
                Purchase purchase = null;
                s_purchaseCache[p.Id] = purchase;
            }
            }

        }
    }


    return profile;
}

呼叫GetUsername会引发http 500错误

0 个答案: