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if(!Int32.TryParse(Request.Form[“age”]， out age)){
xxxx…
}
If(age < xxx || age > xxx){
xxxx…
}

Student student = new Student(){
Source = -1
};
bool validateResult = student.Validate();
Assert.IsFalse(validateResult);

public class RangeAttribute : Attribute{
public int Mix{ get; set; } //范圍下限
public int Max{ get; set; } //范圍上限
public string Message{ get; set;} //出錯信息

public RangeAttribute(int min， int max， string message){
Min = min;
Max = max;
Message = message;
}
}

public class Student{
[Range(0， 100， “分數(shù)的范圍必須在{0}和{1}之間.”)]
public int Source{ get; set; }
}

public bool Validate(){
bool result = true;
Type type = this.GetType();
PropertyInfo property = type.GetProperty(“Source”); //獲取Source屬性
RangeAttribute [] attributes =
property.GetCustomAttributes(typeof(Attribute)， true)
as RangeAttribute []; //獲取Range屬性集合
//遍歷集合對屬性進行驗證
foreach(var item in attribute){
int value = (int)property.GetValue(this， null);
if(value < item.Min || value > item.Max){
result = false;
}
}
return result;
}

[Range(6， 150， "學(xué)生年齡必須在{0}和{1}之間.")]
public int Age { get; set; }
那么我們的Validate方法是否能正確驗證呢?為了驗證結(jié)果，我們重新編寫測試:

[TestMethod()]
public void ValidateTest() {
Student student = new Student() {
Source = 80，
Age = 0
};
bool validateResult = student.Validate();
Assert.IsFalse(validateResult);
student.
validateResult = student.Validate();
}

public bool Validate() {
bool result = true;
Type type = this.GetType();
PropertyInfo[] properties = type.GetProperties();
foreach (var property in properties) {
RangeAttribute[] attributes =
property.GetCustomAttributes(typeof(RangeAttribute)， true) as RangeAttribute[];
foreach (var item in attributes) {
int value = (int)property.GetValue(this， null);
if (value < item.Min || value > item.Max) {
result = false;
}
}
}
return result;
}

[AttributeUsage(AttributeTargets.Property)]
public class RequiredAttribute : Attribute {
public bool IsRequired { get; set; }
public string Message { get; set; }
public RequiredAttribute(string message) {
IsRequired = true;
Message = message;
}
}

[Required]
public string Name { get; set; }
再次修改測試代碼:

[TestMethod()]
public void ValidateTest() {
Student student = new Student() {
Age = 20，
Source = 89，
Name = string.Empty
};
bool validateResult = student.Validate();
Assert.IsFalse(validateResult);
}

public bool Validate() {
bool result = true;
bool requiredResult = true;
Type type = this.GetType();
PropertyInfo[] properties = type.GetProperties();
foreach (var property in properties) {
RangeAttribute[] attributes =
property.GetCustomAttributes(typeof(RangeAttribute)， true)
as RangeAttribute[]; //獲取RangeAttribute集合
RequiredAttribute[] requiredAttributes =
property.GetCustomAttributes(typeof(RequiredAttribute)， true)
as RequiredAttribute[]; //獲取RequiredAttribute集合
//遍歷RangeAttribute進行驗證
foreach (var item in attributes) {
int value = (int)property.GetValue(this， null);
if (value < item.Min || value > item.Max) {
result = false;
}
}
//遍歷RequiredAttr進行驗證
foreach (var item in requiredAttributes) {
object value = property.GetValue(this， null);
if (value is string) {
if (String.IsNullOrEmpty((value as string))) {
requiredResult = false;
}
} else {
if (value == null) {
requiredResult = false;
}
}
}
}
return result && requiredResult;
}