Дипломная работа: Автоматизация и обеспечение информационной безопасности приема заявок на ремонт и модернизацию ПК в ООО "Гео-СВЕТ"

Скачать

Заказать новую работу

Внимание! Если размещение файла нарушает Ваши авторские права, то обязательно сообщите нам
Приложение 2
Листинг программного кода
//Copyright (C) Microsoft Corporation. All rights reserved.
using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Reflection.Emit;
using System.Threading;
namespace System.Linq.Dynamic
{
public static class DynamicQueryable
{
public static IQueryable<T> Where<T>(this IQueryable<T> source, string predicate, params
object[] values) {
return (IQueryable<T>)Where((IQueryable)source, predicate, values);
}
public static IQueryable Where(this IQueryable source, string predicate, params object[] values) {
if (source == null) throw new ArgumentNullException("source");
if (predicate == null) throw new ArgumentNullException("predicate");
LambdaExpression lambda = DynamicExpression.ParseLambda(source.ElementType,
typeof(bool), predicate, values);
return source.Provider.CreateQuery(
Expression.Call(
typeof(Queryable), "Where",
new Type[] { source.ElementType },
source.Expression, Expression.Quote(lambda)));
}
public static IQueryable Select(this IQueryable source, string selector, params object[] values) {
if (source == null) throw new ArgumentNullException("source");
if (selector == null) throw new ArgumentNullException("selector");
LambdaExpression lambda = DynamicExpression.ParseLambda(source.ElementType, null,
selector, values);
return source.Provider.CreateQuery(
Expression.Call(
typeof(Queryable), "Select",
new Type[] { source.ElementType, lambda.Body.Type },
source.Expression, Expression.Quote(lambda)));
}
public static IQueryable<T> OrderBy<T>(this IQueryable<T> source, string ordering, params
object[] values) {
return (IQueryable<T>)OrderBy((IQueryable)source, ordering, values);
}
public static IQueryable OrderBy(this IQueryable source, string ordering, params object[] values)
{
if (source == null) throw new ArgumentNullException("source");
if (ordering == null) throw new ArgumentNullException("ordering");
98
ParameterExpression[] parameters = new ParameterExpression[] {
Expression.Parameter(source.ElementType, "") };
ExpressionParser parser = new ExpressionParser(parameters, ordering, values);
IEnumerable<DynamicOrdering> orderings = parser.ParseOrdering();
Expression queryExpr = source.Expression;
string methodAsc = "OrderBy";
string methodDesc = "OrderByDescending";
foreach (DynamicOrdering o in orderings) {
queryExpr = Expression.Call(
typeof(Queryable), o.Ascending ? methodAsc : methodDesc,
new Type[] { source.ElementType, o.Selector.Type },
queryExpr, Expression.Quote(Expression.Lambda(o.Selector, parameters)));
methodAsc = "ThenBy";
methodDesc = "ThenByDescending";
}
return source.Provider.CreateQuery(queryExpr);
}
public static IQueryable Take(this IQueryable source, int count) {
if (source == null) throw new ArgumentNullException("source");
return source.Provider.CreateQuery(
Expression.Call(
typeof(Queryable), "Take",
new Type[] { source.ElementType },
source.Expression, Expression.Constant(count)));
}
public static IQueryable Skip(this IQueryable source, int count) {
if (source == null) throw new ArgumentNullException("source");
return source.Provider.CreateQuery(
Expression.Call(
typeof(Queryable), "Skip",
new Type[] { source.ElementType },
source.Expression, Expression.Constant(count)));
}
public static IQueryable GroupBy(this IQueryable source, string keySelector, string
elementSelector, params object[] values) {
if (source == null) throw new ArgumentNullException("source");
if (keySelector == null) throw new ArgumentNullException("keySelector");
if (elementSelector == null) throw new ArgumentNullException("elementSelector");
LambdaExpression keyLambda = DynamicExpression.ParseLambda(source.ElementType,
null, keySelector, values);
LambdaExpression elementLambda = DynamicExpression.ParseLambda(source.ElementType,
null, elementSelector, values);
return source.Provider.CreateQuery(
Expression.Call(
typeof(Queryable), "GroupBy",
new Type[] { source.ElementType, keyLambda.Body.Type, elementLambda.Body.Type
},
source.Expression, Expression.Quote(keyLambda), Expression.Quote(elementLambda)));
}
public static bool Any(this IQueryable source) {
if (source == null) throw new ArgumentNullException("source");
return (bool)source.Provider.Execute(
Expression.Call(
99
typeof(Queryable), "Any",
new Type[] { source.ElementType }, source.Expression));
}
public static int Count(this IQueryable source) {
if (source == null) throw new ArgumentNullException("source");
return (int)source.Provider.Execute(
Expression.Call(
typeof(Queryable), "Count",
new Type[] { source.ElementType }, source.Expression));
}
}
public abstract class DynamicClass
{
public override string ToString() {
PropertyInfo[] props = this.GetType().GetProperties(BindingFlags.Instance |
BindingFlags.Public);
StringBuilder sb = new StringBuilder();
sb.Append("{");
for (int i = 0; i < props.Length; i++) {
if (i > 0) sb.Append(", ");
sb.Append(props[i].Name);
sb.Append("=");
sb.Append(props[i].GetValue(this, null));
}
sb.Append("}");
return sb.ToString();
}
}
public class DynamicProperty
{
string name;
Type type;
public DynamicProperty(string name, Type type) {
if (name == null) throw new ArgumentNullException("name");
if (type == null) throw new ArgumentNullException("type");
this.name = name;
this.type = type;
}
public string Name {
get { return name; }
}
public Type Type {
get { return type; }
}
}
public static class DynamicExpression
{
public static Expression Parse(Type resultType, string expression, params object[] values) {
ExpressionParser parser = new ExpressionParser(null, expression, values);
return parser.Parse(resultType);
100
}
public static LambdaExpression ParseLambda(Type itType, Type resultType, string expression,
params object[] values) {
return ParseLambda(new ParameterExpression[] { Expression.Parameter(itType, "") },
resultType, expression, values);
}
public static LambdaExpression ParseLambda(ParameterExpression[] parameters, Type
resultType, string expression, params object[] values) {
ExpressionParser parser = new ExpressionParser(parameters, expression, values);
return Expression.Lambda(parser.Parse(resultType), parameters);
}
public static Expression<Func<T, S>> ParseLambda<T, S>(string expression, params object[]
values) {
return (Expression<Func<T, S>>)ParseLambda(typeof(T), typeof(S), expression, values);
}
public static Type CreateClass(params DynamicProperty[] properties) {
return ClassFactory.Instance.GetDynamicClass(properties);
}
public static Type CreateClass(IEnumerable<DynamicProperty> properties) {
return ClassFactory.Instance.GetDynamicClass(properties);
}
}
internal class DynamicOrdering
{
public Expression Selector;
public bool Ascending;
}
internal class Signature : IEquatable<Signature>
{
public DynamicProperty[] properties;
public int hashCode;
public Signature(IEnumerable<DynamicProperty> properties) {
this.properties = properties.ToArray();
hashCode = 0;
foreach (DynamicProperty p in properties) {
hashCode ^= p.Name.GetHashCode() ^ p.Type.GetHashCode();
}
}
public override int GetHashCode() {
return hashCode;
}
public override bool Equals(object obj) {
return obj is Signature ? Equals((Signature)obj) : false;
}
public bool Equals(Signature other) {
if (properties.Length != other.properties.Length) return false;
101
for (int i = 0; i < properties.Length; i++) {
if (properties[i].Name != other.properties[i].Name ||
properties[i].Type != other.properties[i].Type) return false;
}
return true;
}
}
internal class ClassFactory
{
public static readonly ClassFactory Instance = new ClassFactory();
static ClassFactory() { } // Trigger lazy initialization of static fields
ModuleBuilder module;
Dictionary<Signature, Type> classes;
int classCount;
ReaderWriterLock rwLock;
private ClassFactory() {
AssemblyName name = new AssemblyName("DynamicClasses");
AssemblyBuilder assembly = AppDomain.CurrentDomain.DefineDynamicAssembly(name,
AssemblyBuilderAccess.Run);
#if ENABLE_LINQ_PARTIAL_TRUST
new ReflectionPermission(PermissionState.Unrestricted).Assert();
#endif
try {
module = assembly.DefineDynamicModule("Module");
}
finally {
#if ENABLE_LINQ_PARTIAL_TRUST
PermissionSet.RevertAssert();
#endif
}
classes = new Dictionary<Signature, Type>();
rwLock = new ReaderWriterLock();
}
public Type GetDynamicClass(IEnumerable<DynamicProperty> properties) {
rwLock.AcquireReaderLock(Timeout.Infinite);
try {
Signature signature = new Signature(properties);
Type type;
if (!classes.TryGetValue(signature, out type)) {
type = CreateDynamicClass(signature.properties);
classes.Add(signature, type);
}
return type;
}
finally {
rwLock.ReleaseReaderLock();
}
}
Type CreateDynamicClass(DynamicProperty[] properties) {
LockCookie cookie = rwLock.UpgradeToWriterLock(Timeout.Infinite);
try {
Источник: https://baza.diplomsite.ru/previewfile/1781

Смотрите также:

2014 biblioonline ru
Изложение содержания дела, по которому приняты судебные постановления
Отформатировать текстовый фрагмент в MS Word. Текстовый фрагмент, который подлежит форматированию, приведен в документе Задание 1, прикрепленном ниже.