1
我在2個字符串變量中擁有屬性名稱和值。當屬性類型是例如字符串時很容易設置:如何將值設置爲C#中的枚舉屬性
prop.SetValue(P, Value, null);
但是如何枚舉類型? 請看下面的例子:
public enum enmSex { Male, Female, Trans };
public enum enmMaritalStatus { Married, Single, Divorced, Widowed };
private class Person
{
public string GivenName { get; set; }
public int Age { get; set; }
public double Weight { get; set; }
public enmSex Sex { get; set; }
public enmMaritalStatus MaritalStatus { get; set; }
}
private List<Person> People = new List<Person>();
private void SetPersonProperty(string GivenName, string Property, string Value)
{
Person P = People.Where(c => c.GivenName == GivenName).First();
PropertyInfo prop = typeof(Person).GetProperties().Where(p => p.Name == Property).First();
if (prop.PropertyType == typeof(double))
{
double d;
if (double.TryParse(Value, out d))
prop.SetValue(P, Math.Round(d, 3), null);
else
MessageBox.Show("\"" + Value + "\" is not a valid floating point number.");
}
else if (prop.PropertyType == typeof(int))
{
int i;
if (int.TryParse(Value, out i))
prop.SetValue(P, i, null);
else
MessageBox.Show("\"" + Value + "\" is not a valid 32bit integer number.");
}
else if (prop.PropertyType == typeof(string))
{
prop.SetValue(P, Value, null);
}
else if (prop.PropertyType.IsEnum)
{
prop.SetValue(P, Value, null); // Error!
}
}
private void button1_Click(object sender, EventArgs e)
{
People.Add(new Person { GivenName = "Daniel" });
People.Add(new Person { GivenName = "Eliza" });
People.Add(new Person { GivenName = "Angel" });
People.Add(new Person { GivenName = "Ingrid" });
SetPersonProperty("Daniel", "Age", "18");
SetPersonProperty("Eliza", "Weight", "61.54442");
SetPersonProperty("Angel", "Sex", "Female");
SetPersonProperty("Ingrid", "MaritalStatus", "Divorced");
SetPersonProperty("Angel", "GivenName", "Angelina");
}
private void button2_Click(object sender, EventArgs e)
{
foreach (Person item in People)
MessageBox.Show(item.GivenName + ", " + item.Age + ", " +
item.Weight + ", " + item.Sex + ", " + item.MaritalStatus);
}
怎麼樣'MartialStatus .Divorced'?你傳入一個字符串而不是一個枚舉,你可以使用Enum.Parse。爲什麼你使用反射方式,而不是直接在'person.Sex = Sex.Femail'中的實例上設置屬性?順便說一句,它是_female_,當然不是_femail_。 – oerkelens
顯然你需要['Enum.Parse'](https://msdn.microsoft.com/en-us/library/essfb559(v = vs.110).aspx)或類似的,例如'prop.SetValue(P ,Enum.Parse(prop.PropertyType,Value),null);' –
這只是我爲我的問題準備的一個例子。我的代碼有一個非常大的類,有幾個枚舉類型,並且將它帶到這裏非常複雜。如果您只複製並粘貼此代碼,則會遇到該錯誤。我只是不知道如何解決它。我也不能對我複雜的代碼做很多修改。另外我不知道如何使用Enum.Parse。我真的想要一個工作解決方案。謝謝。 –