SerializedProperty.contentHash

描述

提供属性的哈希值。（只读）

您可以使用它来跟踪属性路径下的值是否发生了任何更改（其他资源：SerializedProperty.propertyPath）。

请注意
-如果属性内容的大小小于或等于 32 位，则将返回内容而不是哈希值。
-如果属性路径指向数组或复杂类型，则哈希将对应于整个内容。
-如果属性是带有 [SerializeReference] 属性的字段，或者包含此类字段的复合类型，则内容哈希不包括引用的对象的内容，而是仅对引用 ID 进行哈希（其他资源：SerializedProperty.managedReferenceId）。

using UnityEngine;
using UnityEditor;

public class MyObject : ScriptableObject
{
    public string myString = "answer to life the universe and everything";
    public string[] myStringArray = { "answer", "to", "life", "the", "universe", "and", "everything" };
    public int[] myIntArray = { 42, 442, 422, 4242 };

    [MenuItem("Example/Output contentHash from SerializedProperty")]
    static void OutputContentHashFromSerializedProperty()
    {
        var scriptableObject = ScriptableObject.CreateInstance<MyObject>();

        using (var serializedObject = new SerializedObject(scriptableObject))
        {
            SerializedProperty serializedPropertyMyString = serializedObject.FindProperty("myString");
            SerializedProperty serializedPropertyMyStringArray = serializedObject.FindProperty("myStringArray");
            SerializedProperty serializedPropertyMyIntArray = serializedObject.FindProperty("myIntArray");

            uint myStringHash = serializedPropertyMyString.contentHash;
            uint myStringArrayHash = serializedPropertyMyStringArray.contentHash;
            uint MyIntArrayHash = serializedPropertyMyIntArray.contentHash;

            serializedPropertyMyString.stringValue = "new string";
            serializedPropertyMyIntArray.DeleteArrayElementAtIndex(1);

            serializedObject.ApplyModifiedPropertiesWithoutUndo();

            Debug.Log(string.Format("myString: before={0}, after={1}, changed={2}", myStringHash, serializedPropertyMyString.contentHash, myStringHash == serializedPropertyMyString.contentHash ? "no" : "yes"));
            Debug.Log(string.Format("myStringArrayHash: before={0}, after={1}, changed={2}", myStringArrayHash, serializedPropertyMyStringArray.contentHash, myStringArrayHash == serializedPropertyMyStringArray.contentHash ? "no" : "yes"));
            Debug.Log(string.Format("MyIntArrayHash: before={0}, after={1}, changed={2}", MyIntArrayHash, serializedPropertyMyIntArray.contentHash, MyIntArrayHash == serializedPropertyMyIntArray.contentHash ? "no" : "yes"));
        }
    }
}