如何通過反射一個字符串賦值給一個整數字段

Question

所以這是一個讓我傷心的代碼：

private static void AssignId(object entity, string id) 
     { 
      var idFieldInfo = entity.GetType().GetProperties().SingleOrDefault(it => it.GetCustomAttributes(typeof(KeyAttribute), false).Any()); 
      if (idFieldInfo != null) 
      { 
       var type = idFieldInfo.PropertyType; 

       if (type == typeof(byte)) 
       { 
        idFieldInfo.SetValue(entity, Convert.ToByte(id), null); 
       } 
       else if (type == typeof(short)) 
       { 
        idFieldInfo.SetValue(entity, Convert.ToInt16(id), null); 
       } 
       else if (type == typeof(int)) 
       { 
        idFieldInfo.SetValue(entity, Convert.ToInt32(id), null); 
       } 
       else if (type == typeof(long)) 
       { 
        idFieldInfo.SetValue(entity, Convert.ToInt64(id), null); 
       } 
       else if (type == typeof(sbyte)) 
       { 
        idFieldInfo.SetValue(entity, Convert.ToSByte(id), null); 
       } 
       else if (type == typeof(ushort)) 
       { 
        idFieldInfo.SetValue(entity, Convert.ToUInt16(id), null); 
       } 
       else if (type == typeof(uint)) 
       { 
        idFieldInfo.SetValue(entity, Convert.ToUInt32(id), null); 
       } 
       else if (type == typeof(ulong)) 
       { 
        idFieldInfo.SetValue(entity, Convert.ToUInt64(id), null); 
       } 
      } 
     } 

是否有分配相應的整數

Answer 1

您可以使用一個字符串值的明智之選Convert.ChangeType

if (idFieldInfo != null) 
{ 
    var type = idFieldInfo.PropertyType; 
    idFieldInfo.SetValue(entity, Convert.ChangeType(id, type), null); 
}