如何从字典会话中获取价值 [英] How to get value from dictionary session

问题描述

我在会话中使用如下字典存储了多个值

< pre> var get_values = new Dictionary< string，object>（）; 
 
 get_values [name] = model.Name; ; 
 get_values [address] = model.Address; 
 get_values [phone] = model.Phone; 
 get_values [email] = model.Email; 
 
 
会话[sess_values] = get_values; 

现在我想获得价值从会议一个接一个。我的问题是如何从名称，地址等会话中获取价值？



我尝试了什么：

< pre>< pre> var get_values = new Dictionary< string，object>（）; 
 
 get_values [name] = model.Name; ; 
 get_values [address] = model.Address; 
 get_values [phone] = model.Phone; 
 get_values [email] = model.Email; 
 
 
会话[sess_values] = get_values; 

解决方案

尝试：

字典<字符串，字符串> values =会话[  sess_values]  as 字典< string，string> ;; 
  if （values！=  null ）
 {
  string  name = values [  name]; 
 ... 

简单：从会话中检索字典;如果它不为null，请尝试从字典中检索值。

  var  values =（Dictionary< string，object>）Session [  sess_values]; 
  if （values！=  null ）
 {
  object   value ; 
  if （values.TryGetValue（  name ， out   value ））
 {
  string  s =  value   as  串; 
  if （s！=  null ）
 {
 model。名字= s; 
} 
} 
} 

如果您使用的是最新版本的Visual Studio，可以稍微简化一下：

  var  values =（Dictionary< string，object>）Session [  sess_values]; 
  if （values？.TryGetValue（ 名称， out   object   value ）&&  value     string  s）
 {
 model.Name = s; 
} 

但为什么你使用字典< TKey，TValue> 并不明显首先，当你可以直接使用会话时：

会话[  name] = model.Name; 
 model.Name =（ string ）会话[ 名]; 

i have stored multiple values in session using dictionary like below

<pre> var get_values = new Dictionary<string, object>();

                        get_values["name"] = model.Name; ;
                        get_values["address"] = model.Address;
                        get_values["phone"] = model.Phone;
                        get_values["email"] = model.Email;
                        

                        Session["sess_values"] = get_values;

now i want to get values from session one by one. my question is how to get values from session like name, address etc.?

What I have tried:

<pre><pre> var get_values = new Dictionary<string, object>();

                        get_values["name"] = model.Name; ;
                        get_values["address"] = model.Address;
                        get_values["phone"] = model.Phone;
                        get_values["email"] = model.Email;
                        

                        Session["sess_values"] = get_values;

解决方案

Try:

Dictionary<string, string> values = Session["sess_values"] as Dictionary<string, string>;
if (values != null)
   {
   string name = values["name"];
    ...

Simple: retrieve the dictionary from the session; if it's not null, try to retrieve the value from the dictionary.

var values = (Dictionary<string, object>)Session["sess_values"];
if (values != null)
{
    object value;
    if (values.TryGetValue("name", out value))
    {
        string s = value as string;
        if (s != null)
        {
            model.Name = s;
        }
    }
}

If you're using a recent version of Visual Studio, you can simplify that slightly:

var values = (Dictionary<string, object>)Session["sess_values"];
if (values?.TryGetValue("name", out object value) && value is string s)
{
    model.Name = s;
}

But it's not obvious why you're using a Dictionary<TKey, TValue> in the first place, when you could just use the session directly:

Session["name"] = model.Name;
model.Name = (string)Session["name"];

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