不能在同一类内的函数中使用声明类的变量。为什么 ？
我在“Main”类中声明了一个名为“context2”的变量。但我无法在函数“Main_Load”中使用该变量。我做错了什么？
using System;
using System.Windows.Forms;
using Soapi;
using Soapi.Domain;
namespace SO_Console_Client
{
public partial class Main : Form
{
const string apiKey = "*************";
var context2 = new ApiContext(apiKey).Initialize(false);
public Main(String GravatarURL, User user)
{
InitializeComponent();
pictureBox1.Load(GravatarURL); //Loads the Gravatar image from the url
//set the reputation details
lblRep.Text = String.Format("Reputation: {0}", user.Reputation);
//Sets the badge details
lblBadge.Text = String.Format("Badges: gold={0} silver={1} bronze={2}", user.BadgeCounts.Gold, user.BadgeCounts.Silver, user.BadgeCounts.Bronze);
groupBox1.Text = user.DisplayName.ToString();
}
private void Main_Load(object sender, EventArgs e)
{
Soapi.Queries.QuestionsUnansweredQuery query = context2.Official.StackOverflow.Questions.Unanswered;
foreach (Question q in query)
{
try
{
Console.WriteLine(q.Title.ToString());
//Console.WriteLine(q.Body.ToString());
}
catch (System.NullReferenceException ex)
{
}
}
}
}
}
i have declared a variable in the class 'Main' with name 'context2'. But i cannot use the variable inside the function 'Main_Load'. what am i doing wrong ?
using System;
using System.Windows.Forms;
using Soapi;
using Soapi.Domain;
namespace SO_Console_Client
{
public partial class Main : Form
{
const string apiKey = "*************";
var context2 = new ApiContext(apiKey).Initialize(false);
public Main(String GravatarURL, User user)
{
InitializeComponent();
pictureBox1.Load(GravatarURL); //Loads the Gravatar image from the url
//set the reputation details
lblRep.Text = String.Format("Reputation: {0}", user.Reputation);
//Sets the badge details
lblBadge.Text = String.Format("Badges: gold={0} silver={1} bronze={2}", user.BadgeCounts.Gold, user.BadgeCounts.Silver, user.BadgeCounts.Bronze);
groupBox1.Text = user.DisplayName.ToString();
}
private void Main_Load(object sender, EventArgs e)
{
Soapi.Queries.QuestionsUnansweredQuery query = context2.Official.StackOverflow.Questions.Unanswered;
foreach (Question q in query)
{
try
{
Console.WriteLine(q.Title.ToString());
//Console.WriteLine(q.Body.ToString());
}
catch (System.NullReferenceException ex)
{
}
}
}
}
}
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评论（3）
隐式输入不适用于字段；它仅适用于局部变量。
我认为这就是您的真正意图：
在极不可能的情况下，
ApiContext是某种连贯接口，ApiContext.Initialize(bool)< /code> 返回一个不同ApiContext对象，这应该是您想要的：尽管如果您这样做会更清楚：
不过，我真的对此表示怀疑。
Implicit typing doesn't work with fields; it only works with local variables.
I think this is what your real intention is:
In the highly unlikely case that
ApiContextis some sort of fluent-interface for whichApiContext.Initialize(bool)returns a differentApiContextobject, this should be what you want:although it would be much clearer if you did:
I really doubt that, though.
这不能编译。
var类型变量声明不能在类级别，只能在方法级别。This can't compile.
var-type variable declarations cannot be at the class level, only the method level.允许 var 与字段一起使用存在技术问题。这就是为什么必须指定具体类型的原因。以下是 Eric Lippert 对问题的解释：
为什么不字段上的 var
There are technical issues with allowing var to be used with fields. This is why a concrete type must be specified. Here is an explanation of the issues from Eric Lippert:
Why no var on fields