JSON数组C＃上的foreach循环

Question

I have en error in a foreach loop and I don't understand why. Can you help me?

this is for a small project for me.

json:

{
    "buttonByColumn": 1,
    "buttonByLine": 1,
    "iconSize": 100,
    "settingsbutton": 1,
    "settingsshortcut": "Escape",
    "buttons": {
        "button1": {
            "name": "test",
            "type": "",
            "path": "",
            "shortcut": "E",
            "iconPath": ""
        }
    }
}

c#:

public Keys[] kc;

dynamic mylist = JsonConvert.DeserializeObject(fileText);
kc = new Keys[buttonByColumn * buttonByLine];
kc[0] = (Keys)Enum.Parse(typeof(Keys), (string)mylist.settingsshortcut);

int i = 1;
foreach (dynamic item in mylist.buttons)
{
    kc[i] = (Keys)Enum.Parse(typeof(Keys), (string)item.shortcut);//error is here
    i++;
}

error:

$exception {"'Newtonsoft.Json.Linq.JProperty' does not contain any definition for 'shortcut'"} Microsoft.CSharp.RuntimeBinder.RuntimeBinderException

Answer 1

In your JSON, buttons is not an array; it is an object. So your foreach loop is actually iterating over the properties of the buttons object, of which the first (and only) property is button1 . shortcut is inside the button1 object; it is not directly inside buttons , so that is why you are getting an error. Since item is actually a JProperty under the covers, you need to use the Value accessor to get down to the shortcut .

Try like this instead:

kc[i] = (Keys)Enum.Parse(typeof(Keys), (string)item.Value.shortcut);

Also note that your kc array may not be sized large enough: you are using an extra element for the settingsshortcut . So you probably need to add one to account for that.

Fiddle: https://dotnetfiddle.net/9DZxwc