我需要將兩個輸入雙數相除，并使用 try catch 來處理 DivideByZeroException 等。ParameterExpression dInput1 = Expression.Parameter(typeof(double), "input1");ParameterExpression dInput2 = Expression.Parameter(typeof(double), "input2");ParameterExpression e_DBZ = Expression.Parameter(typeof(DivideByZeroException));ParameterExpression e_ = Expression.Parameter(typeof(Exception));var _calc = Expression.Divide(dInput1, dInput2);MethodInfo _consolewrite = typeof(Console).GetMethod("WriteLine",new Type[] { typeof(string) });MethodCallExpression _output = Expression.Call(null, _consolewrite, Expression.Convert(Expression.Constant(_calc,typeof(double)), typeof(string)));var _catch_DivideByZeroException = Expression.Catch(e_DBZ, Expression.Call(null, _consolewrite, Expression.Property(e_DBZ, "Message")));var _catch_Exception = Expression.Catch(e_, Expression.Call(null, _consolewrite, Expression.Property(e_DBZ, "Message")));var _calc_Block = Expression.Block(_calc, Expression.Constant(0));var _try = Expression.TryCatch(_calc_Block, _catch_DivideByZeroException, _catch_Exception);var _lambda = Expression.Lambda<Func<double,double, double>>(_try, dInput1,dInput2);Console.WriteLine(_lambda.Body);Console.WriteLine(_lambda.Compile().Invoke(1,0));但是 Expression.Convert 會拋出 System.ArgumentException。
2 回答
慕尼黑5688855
TA貢獻1848條經驗 獲得超2個贊
我需要將兩個輸入雙數相除，并使用 try catch 來處理 DivideByZeroException 等。
ParameterExpression dInput1 = Expression.Parameter(typeof(double), "input1");
ParameterExpression dInput2 = Expression.Parameter(typeof(double), "input2");
ParameterExpression e_DBZ = Expression.Parameter(typeof(DivideByZeroException));
ParameterExpression e_ = Expression.Parameter(typeof(Exception));
var _calc = Expression.Divide(dInput1, dInput2);
MethodInfo _consolewrite = typeof(Console).GetMethod("WriteLine",new Type[] { typeof(string) });
MethodCallExpression _output = Expression.Call(null, _consolewrite, Expression.Convert(Expression.Constant(_calc,typeof(double)), typeof(string)));
var _catch_DivideByZeroException = Expression.Catch(e_DBZ, Expression.Call(null, _consolewrite, Expression.Property(e_DBZ, "Message")));
var _catch_Exception = Expression.Catch(e_, Expression.Call(null, _consolewrite, Expression.Property(e_DBZ, "Message")));
var _calc_Block = Expression.Block(_calc, Expression.Constant(0));
var _try = Expression.TryCatch(_calc_Block, _catch_DivideByZeroException, _catch_Exception);
var _lambda = Expression.Lambda<Func<double,double, double>>(_try, dInput1,dInput2);
Console.WriteLine(_lambda.Body);
Console.WriteLine(_lambda.Compile().Invoke(1,0));
但是 Expression.Convert 會拋出 System.ArgumentException。
慕森卡
TA貢獻1806條經驗 獲得超8個贊
這有什么問題？
try
{
var e_DBZ = dInput1 / dInput2;
}
catch (Exception e)
{
// Handle Divide by Zero error
Console.WriteLine(e.Message);
}
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