一文看懂 C# 腳本

Console.Write("測試基本算數(shù)表達(dá)式:(1+2)*3/4");
var?res?=?await?CSharpScript.EvaluateAsync("(1+2)*3/4");
Console.WriteLine(res);

如果需要使用比較復(fù)雜的函數(shù)，可以使用WithImports引入名稱空間：

Console.WriteLine("測試Math函數(shù):Sqrt(2)");
res?=?await?CSharpScript.EvaluateAsync("Sqrt(2)",?ScriptOptions.Default.WithImports("System.Math"));
Console.WriteLine(res);

不僅是計算函數(shù)，其它函數(shù)比如IO，也是可以的：

Console.WriteLine(@"測試輸入輸出函數(shù):Directory.GetCurrentDirectory()");
res?=?await?CSharpScript.EvaluateAsync("Directory.GetCurrentDirectory()",
?????ScriptOptions.Default.WithImports("System.IO"));
Console.WriteLine(res);

字符串函數(shù)可以直接調(diào)用：

Console.WriteLine(@"測試字符串函數(shù):""Hello"".Length");
res?=?await?CSharpScript.EvaluateAsync(@"""Hello"".Length");
Console.WriteLine(res);

如果需要傳遞變量，可以將類的實例作為上下文進(jìn)行傳遞，下面的例子中使用了Student類：

Console.WriteLine(@"測試變量:");
var?student?=?new?Student?{?Height?=?1.75M,?Weight?=?75?};
await?CSharpScript.RunAsync("BMI=Weight/Height/Height",?globals:?student);
Console.WriteLine(student.BMI);

類Student:

public?class?Student
{
????public?Decimal?Height?{?get;?set;?}
????public?Decimal?Weight?{?get;?set;?}
????public?Decimal?BMI?{?get;?set;?}
????public?string?Status?{?get;?set;?}?=?string.Empty;
}

重復(fù)使用的腳本可以復(fù)用：

Console.WriteLine(@"測試腳本編譯復(fù)用:");
var?scriptBMI?=?CSharpScript.Create("Weight/Height/Height",?globalsType:?typeof(Student));
scriptBMI.Compile();

Console.WriteLine((await?scriptBMI.RunAsync(new?Student?{?Height?=?1.72M,?Weight?=?65?})).ReturnValue);

在腳本中也可以定義函數(shù)：

Console.WriteLine(@"測試腳本中定義函數(shù):");
string?script1?=?"decimal?Bmi(decimal?w,decimal?h)?{?return?w/h/h;?}?return?Bmi(Weight,Height);";

var?result?=?await?CSharpScript.EvaluateAsync<decimal>(script1,?globals:?student);
Console.WriteLine(result);

在腳本中也可以定義變量：

Console.WriteLine(@"測試腳本中的變量:");
var?script?=??CSharpScript.Create("int?x=1;");
script?=??script.ContinueWith("int?y=1;");
script?=??script.ContinueWith("return?x+y;");
Console.WriteLine((await?script.RunAsync()).ReturnValue);

完整的實例可以從github下載：https://github.com/zhenl/CSharpScriptDemo