[英]deserialization of json return null in properly formatted json
對C#來說還很新,不勝感激。
得到以下錯誤:“對象引用未設置為對象的實例。” 當我嘗試訪問配方inforeturned.resultslist [0] .title或列表中的任何其他元素時。
但是,我能夠成功返回配方returned.title。
這是json格式的api URL:
http://www.recipepuppy.com/api/?i=onions,garlic&q=omelet&p=3
protected void getButton_Click(object sender, EventArgs e)
{
string url = string.Format("http://www.recipepuppy.com/api/?i={0}&q={1}", ingredientsTextBox.Text, recipetypeTextBox.Text);
using (WebClient client = new WebClient())
{
string json = client.DownloadString(url);
RecipeInfo recipeinforeturned = new RecipeInfo();
recipeinforeturned = (new JavaScriptSerializer()).Deserialize <RecipeInfo>(json);
//next need a loop to go through each list item and add to ResultsListBox to end of recipies
Label1.Text = recipeinforeturned.title;
for (int i = 0; i < recipeinforeturned.resultslist.Count; i++)
{
resultsListBox.Items.Add(recipeinforeturned.resultslist[i].title);
resultsListBox.Items.Add(recipeinforeturned.resultslist[i].ingredients);
resultsListBox.Items.Add(Environment.NewLine);
}
}
}
public class RecipeInfo
{
public string title { get; set; }
public string version { get; set; }
public string href { get; set; }
public List<Results> resultslist { get; set; }
}
public class Results
{
public string title { get; set; }
public string href { get; set; }
public string ingredients { get; set; }
public string thumbnail { get; set; }
}
}
} 任何幫助將不勝感激。
您可以嘗試將“版本”字符串的字段類型更改為雙精度。
public class RootObject
{
public string title { get; set; }
public double version { get; set; }
public string href { get; set; }
public List<Result> results { get; set; }
}
您需要重命名:
public List<Results> resultslist { get; set; }
至
public List<Results> results { get; set; }
否則,反序列化程序會在JSON中尋找resultslist
對象,但找不到它,因此返回null
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