如何手動構建將始終返回true的表達式？

Question

我試圖創建表達式，但失敗。

我想建立類似Expression<Func<typeof(type), bool>> expression = _ => true;

我嘗試：

private static Expression GetTrueExpression(Type type) 
{ 
    LabelTarget returnTarget = Expression.Label(typeof(bool)); 
    ParameterExpression parameter = Expression.Parameter(type, "x"); 

    var resultExpression = 
     Expression.Return(returnTarget, Expression.Constant(true), typeof(bool)); 

    var delegateType = typeof(Func<,>).MakeGenericType(type, typeof(bool)); 

    return Expression.Lambda(delegateType, resultExpression, parameter); ; 
} 

用法：

var predicate = Expression.Lambda(GetTrueExpression(typeof(bool))).Compile(); 

但我得到的錯誤：Cannot jump to undefined label ''