将对象传递给 jint 中的函数并 return 一个值

Question

我试图通过 jint 和 return 值将对象传递给 javascript 函数。但这似乎不起作用。这是我到目前为止尝试过的 -

错误-

Jint.Runtime.JavaScriptException: 'obj is undefined'

使用下面的代码-

var carObj = JsonSerializer.Serialize(car);  

var engine = new Jint.Engine();
engine.SetValue("obj", carObj);

var value = engine
           .Execute("const result = (function car(obj) { const type = obj.Type; return type;})()")
           .GetValue("result");

Answer 1

如 docs, you should pass your POCO car directly to Jint.Engine 所示，而不是尝试将其序列化为 JSON。 Jint 将使用反射来访问它的成员。

因此您的代码可以重写如下：

var value = new Jint.Engine()  // Create the Jint engine
    .Execute("function car(obj) { const type = obj.Type; return type;}") // Define a function car() that accesses the Type field of the incoming obj and returns it.
    .Invoke("car", car);  // Invoke the car() function on the car POCO, and return its result.

或等效于：

var value = new Jint.Engine()
    .SetValue("obj", car) // Define a "global" variable "obj"
    .Execute("const result = (function car(obj) { const type = obj.Type; return type;})(obj)") // Define the car() function, call it with "obj", and set the value in "result"
    .GetValue("result"); // Get the evaluated value of "result"

或

var value = new Jint.Engine()  // Create the Jint engine
    .SetValue("obj", car) // Define a "global" variable "obj"
    .Execute("function car(obj) { const type = obj.Type; return type;}; car(obj);") // Define the car() function, and call it with "obj".
    .GetCompletionValue();  // Get the last evaluated statement completion value

这里我假设 car 是一个具有字符串属性 Type 的 POCO，例如

var car = new 
{
    Type = "studebaker convertible",
};

演示 fiddle here.

将对象传递给 jint 中的函数并 return 一个值

Pass an object to a function in jint and return a value

.net

c#

json.net

jint