Question

我想知道是否有人可以帮助我。我收到的错误是＆＃34; The name 'client' does not exist in the current context＆＃34;。这是参考var tradePileResponse = await client.GetTradePileAsync();行，现在我知道它为什么会发生，但我不知道如何解决它。

我正在使用var client = new FutClient();初始化客户端，但我似乎无法在我的所有应用中使用它。

如何在整个应用中提供此实例？我是否需要在其他地方创建新实例？我试着在课后调用它，但它抱怨说＆＃34; The contextual keyword 'var' may only appear within a local variable declaration＆＃34;

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

            public async void button1_Click(object sender, EventArgs e)
            {
                var client = new FutClient();
                var loginDetails = new LoginDetails(email, password, secret, platform);
                try
                {
                    var loginResponse = await client.LoginAsync(loginDetails);
                    var creditsResponse = await client.GetCreditsAsync();
                    label1.Text = creditsResponse.Credits.ToString();
                }
                catch (Exception ex)
                {
                    this.textBox4.Text = ex.Message;
                    //throw;
                }
            }

            private async void butGetTradepile_Click(object sender, EventArgs e)
            {
                //var client = new FutClient();
                var tradePileResponse = await client.GetTradePileAsync();
                Console.WriteLine(tradePileResponse);
            }

Answer 1

您的问题是范围。你在button1_Click（...）方法中声明变量，在方法结束时变量不再存在，因为垃圾收集。因此，当调用另一个方法时，变量不存在。尝试以下方法，而不是使用＆＃34; var＆＃34;使用方法返回的实际类型，如string，int，...等等。如果FutClient是一个类，我相信它是，使用＆＃34; FutClient客户端＆＃34;。然后将其设置为类的新实例，无论您喜欢什么。

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }
    FutClient client;//<-- declared it here

    public async void button1_Click(object sender, EventArgs e)
    {
        client = new FutClient();// <--I changed this
        var loginDetails = new LoginDetails(email, password, secret, platform);
        try
        {
            var loginResponse = await client.LoginAsync(loginDetails);
            var creditsResponse = await client.GetCreditsAsync();
            label1.Text = creditsResponse.Credits.ToString();
        }
        catch (Exception ex)
        {
            this.textBox4.Text = ex.Message;
            //throw;
        }
    }

    private async void butGetTradepile_Click(object sender, EventArgs e)
    {
        //var client = new FutClient();
        var tradePileResponse = await client.GetTradePileAsync();
        Console.WriteLine(tradePileResponse);
    }
}

Answer 2

您需要将client的声明移出button1_Click()方法，并将其设为类级属性。

public partial class Form1 : Form
{
    private FutClient _client;

    public Form1()
    {
        InitializeComponent();
        _client = new FutClient();
    }
}

现在，您可以使用_client和button1_Click()

中的butGetTradepile_Click()

名称＆＃39; <名称>＆＃39;在当前上下文中不存在</name>

2 个答案: