Xamarin Android JSON反序列化报错：无法将JSON对象转为数组类型

Hey there, let's break down what's causing this error and fix it quickly.

The Root Cause #

The error message spells it out clearly: your API is returning a single JSON object (structured like { "Office": "...", ... }), but your code is trying to deserialize it into a List<Galeri>—which expects a JSON array (structured like [{...}, {...}]). That mismatch is why you're getting the deserialization failure.

Solution 1: Adjust Code to Handle Single Object #

If your API is only supposed to return one office entry (which seems to be the case here), modify your deserialization code to target a single Galeri instance instead of a list. Then, if your adapter needs a list to work with, just wrap the single object in a list:

RunOnUiThread(() => {
    // Deserialize to a single Galeri object first
    var singleGaleri = JsonConvert.DeserializeObject<Galeri>(e.Result);
    
    // Wrap it in a List to match your adapter's requirement
    itemGaleri = new List<Galeri> { singleGaleri };
    
    CustomListAdapter adapter = new CustomListAdapter(this, itemGaleri);
    DaftarGaleri.Adapter = adapter;
    progress.Visibility = ViewStates.Gone;
    DaftarGaleri.ItemClick += DaftarGaleri_ItemClick;
} );

Solution 2: Adjust API to Return an Array (If Needed) #

If your API is supposed to return multiple office entries but is currently sending a single object, you'll need to update the backend to wrap the response in square brackets ([]) to make it a valid JSON array. For example:

[{"Office":"دكتور نيوترشن", "officename":"11111111", ...}]

This would let your original list deserialization code work as intended, but this requires changes to the API itself.

Quick Checks to Verify #

• Log the raw e.Result value to your console to confirm the exact JSON structure from the API.
• Note that your Galeri class has a membertype property which isn't present in the API response—Json.NET will ignore this missing field by default, so no extra work is needed here unless you require it to have a default value.

内容的提问来源于stack exchange，提问作者Mr.Balaha