Visual Studio 2019中Windows Forms项目的C# foreach遍历获取所有pakFilename问题求助

Hey! I see you're trying to grab every pakFilename from the Fortnite API response instead of just the first one. Let's get this sorted out for you quickly.

Quick Fix with dynamic #

Since you're already using dynamic to deserialize the JSON, you can directly iterate over the dynamicsKeys array with a foreach loop. Here's how to adjust your existing code:

WebClient client = new WebClient();
string strpagecode = client.DownloadString("https://fortnite-api.com/v2/aes");
dynamic dobj = JsonConvert.DeserializeObject<dynamic>(strpagecode);

// Clear the TextBox first to avoid mixing old and new content
aes.Text = string.Empty;

// Loop through every entry in the dynamicsKeys array
foreach (var keyEntry in dobj["data"]["dynamicsKeys"])
{
    string pakFileName = keyEntry["pakFilename"].ToString();
    // Append each filename to the TextBox with a newline for readability
    aes.Text += pakFileName + Environment.NewLine;
}

This code goes through every element in the dynamicsKeys collection, pulls out the pakFilename from each entry, and adds it to your aes TextBox.

More Robust Approach: Strongly-Typed Classes #

While dynamic works for quick tests, it doesn't give you compile-time error checks or IntelliSense—easy to mistype a property name and break things later. A better practice is to define classes that match the API's JSON structure, then deserialize into those classes:

First, create the model classes:

public class AesApiResponse
{
    public AesData data { get; set; }
}

public class AesData
{
    public List<DynamicAesKey> dynamicsKeys { get; set; }
}

public class DynamicAesKey
{
    public string pakFilename { get; set; }
    // Add other properties from the API here (like "key" or "name") if you need them
}

Then update your main code:

WebClient client = new WebClient();
string strpagecode = client.DownloadString("https://fortnite-api.com/v2/aes");
AesApiResponse apiResponse = JsonConvert.DeserializeObject<AesApiResponse>(strpagecode);

aes.Text = string.Empty;

foreach (var key in apiResponse.data.dynamicsKeys)
{
    aes.Text += key.pakFilename + Environment.NewLine;
}

With this approach, Visual Studio will give you IntelliSense for the properties, and any typos will be caught at compile time instead of runtime.

Bonus: Modernize with HttpClient #

Note that WebClient is obsolete in newer .NET versions. For a more efficient, async-friendly approach, use HttpClient instead. Just mark your event handler as async:

private async void FetchAesKeysButton_Click(object sender, EventArgs e)
{
    aes.Text = "Loading...";
    
    using (HttpClient client = new HttpClient())
    {
        try
        {
            string strpagecode = await client.GetStringAsync("https://fortnite-api.com/v2/aes");
            AesApiResponse apiResponse = JsonConvert.DeserializeObject<AesApiResponse>(strpagecode);
            
            aes.Text = string.Empty;
            foreach (var key in apiResponse.data.dynamicsKeys)
            {
                aes.Text += key.pakFilename + Environment.NewLine;
            }
        }
        catch (Exception ex)
        {
            aes.Text = $"Error: {ex.Message}";
        }
    }
}

This adds basic error handling too, so your app won't crash if there's a network issue or API error.

内容的提问来源于stack exchange，提问作者salvatore20553