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این ساختمان داده، داخل Memory پیاده سازی شده است و تعدادی از متغیرهایی را که ما داخل کد ایجاد میکنیم، در این نوع ساختمان داده از Memory نگهداری میشوند.
شرط قرار گرفتن مقدار یک متغیر داخل Stack این است که متغیر از نوع Value Type باشد. در زبان #C، بطور کلی Struct و Enumها Value Type هستند و بصورت پیشفرض داخل Stack قرار میگیرند. تمامی ValueTypeها در #C، بطور implicit از System.ValueType ارث بری میکنند.
Typeهای زیر، Value Typeهای پیشفرض تعریف شدهی در زبان #C هستند که به آنها Simple Type نیز گفته میشوند:
Represents | Type |
Boolean value | bool |
8-bit unsigned integer | byte |
16-bit Unicode character | char |
128-bit precise decimal values with 28-29 significant digits | decimal |
64-bit double-precision floating point type | double |
32-bit single-precision floating point type | float |
32-bit signed integer type | int |
64-bit signed integer type | long |
8-bit signed integer type | sbyte |
16-bit signed integer type | short |
32-bit unsigned integer type | uint |
64-bit unsigned integer type | ulong |
16-bit unsigned integer type | ushort |
public static int Add(int number1, int number2) { // number1 is on the stack (function parameter) // number2 is on the stack (function parameter) int sum = number1 + number2; // sum is on the stack (local variable) return sum; }
C:\Program Files (x86)\Microsoft SDKs\Windows\{version}\Bin\ildasm.exe
.method private hidebysig static int32 Add(int32 number1, int32 number2) cil managed { .locals init (int32 V_0, int32 V_1) IL_0001: ldarg.0 // Stack is: [2] IL_0002: ldarg.1 // Stack is: [2, 5] IL_0003: add // Stack is: [7] IL_0004: stloc.0 // Stack is: [] and V_0's value is: 7 IL_0005: ldloc.0 // Stack is: [7] IL_0006: stloc.1 // Stack is: [] and V_1's value is: 7 IL_0009: ldloc.1 // Stack is: [7] IL_000a: ret // Return [7] }
.Heap: a group of things placed, thrown, or lying one on another
public static void SayHi() { string name = "Moien"; }
.method private hidebysig static void SayHi() cil managed { .locals init (string V_0) IL_0001: ldstr "Moien" // Stack is: [memory-address of string in heap] IL_0006: stloc.0 IL_0007: ret }
public static void Boxing() { const int number = 5; object boxedNumber = number; // implicit boxing using implicit cast object boxedNumber = (object)number; // explicit boxing using direct cast }
.method public hidebysig static void Boxing() cil managed { .locals init (object V_0) IL_0001: ldc.i4.5 // Stack is: [5] IL_0002: box [System.Runtime]System.Int32 // Stack is: [memory-address of 5 in heap] IL_0007: stloc.0 IL_0008: ret }
public static void Unboxing() { object boxedNumber = 5; int number = (int)boxedNumber; }
.method public hidebysig static void Unboxing() cil managed { .locals init (object V_0, int32 V_1) IL_0001: ldc.i4.5 // Stack is: [5] IL_0002: box [System.Runtime]System.Int32 // Stack is: [memory-address of 5 in heap] IL_0007: stloc.0 // Stack is: [] IL_0008: ldloc.0 // Stack is: [memory-address of 5 in heap] IL_0009: unbox.any [System.Runtime]System.Int32 // Stack is: [5] IL_000e: stloc.1 // Stack is: [] IL_000f: ret }
geography | text |
geometry | timestamp |
image | user-defined data types |
ntext |
نوع داده | بایت بدون sparse | بایت sparse | درصد null |
bit | 0.125 | 5 | 98% |
tinyint | 1 | 5 | 86% |
smallint | 2 | 6 | 76% |
int | 4 | 8 | 64% |
bigint | 8 | 12 | 52% |
real | 4 | 8 | 64% |
float | 8 | 12 | 52% |
smallmoney | 4 | 8 | 64% |
money | 8 | 12 | 52% |
smalldatetime | 4 | 8 | 64% |
datetime | 8 | 12 | 52% |
uniqueidentifier | 16 | 20 | 43% |
date | 3 | 7 | 69% |
نوع داده | بایت بدون sparse | یابت sparse | درصد null |
(datetime(2 | 6 | 10 | 57% |
(datetime(2 | 8 | 12 | 52% |
(time(0 | 3 | 7 | 69% |
(time(7 | 5 | 9 | 60% |
(datetimetoffset(0 | 8 | 12 | 52% |
(datetimetoffset (7 | 10 | 14 | 49% |
(decimal/numeric(1,s | 5 | 9 | 60% |
(decimal/numeric(38,s | 17 | 21 | 42% |
(vardecimal(p,s |
نوع داده |
بایت بدون sparse | یابت sparse | درصد null |
sql_variant | 2* | 2* | 60% |
varchar or char | 2* | 4*+ | 60% |
nvarchar or nchar | 2* | 4* | 60% |
varbinary or binary | 2* | 4* | 60% |
xml | 2* | 4* | 60% |
hierarchyid | 2* | 4* | 60% |
CREATE TABLE Employees_sparse ( EMP_ID INT IDENTITY(5001,1) PRIMARY KEY, SSN CHAR(9) NOT NULL, TITLE CHAR(10) SPARSE NULL, FIRSTNAME VARCHAR(50) NOT NULL, MIDDLEINIT CHAR(1) SPARSE NULL, LASTNAME VARCHAR(50) NOT NULL, EMAIL CHAR(50) SPARSE NULL) GO
CREATE TABLE Employees ( EMP_ID INT IDENTITY(5001,1) PRIMARY KEY, SSN CHAR(9) NOT NULL, TITLE CHAR(10) NULL, FIRSTNAME VARCHAR(50) NOT NULL, MIDDLEINIT CHAR(1) NULL, LASTNAME VARCHAR(50) NOT NULL, EMAIL CHAR(50) NULL) GO
sp_spaceused 'Employees' GO sp_spaceused 'Employees_sparse'
Entity Framework (EF) Core is the rearchitected and rewritten version of the Entity Framework object relational mapping engine for .NET Core applications. It is very light-weight, extensible, and cross platform.
However, high transaction .NET Core applications using EF Core face performance and scalability bottlenecks in the database-tier under peak loads. This is because, although you can linearly scale the application tier by adding more application servers, you cannot add more database servers to scale it.
But, if you use a distributed cache like NCache in your .NET Core applications, you can quickly remove these performance and scalability bottlenecks and handle extreme transaction loads.
List<int> normalList = new List<int> { 1, 2, 3 }; ReadOnlyCollection<int> readonlyList = normalList.AsReadOnly(); FrozenSet<int> frozenSet = normalList.ToFrozenSet(); ImmutableList<int> immutableList = normalList.ToImmutableList(); normalList.Add(4); Console.WriteLine($"List count: {normalList.Count}"); Console.WriteLine($"ReadOnlyList count: {readonlyList.Count}"); Console.WriteLine($"FrozenSet count: {frozenSet.Count}"); Console.WriteLine($"ImmutableList count: {immutableList.Count}");
Uncaught Error: SignalR: Error loading hubs. Ensure your hubs reference is correct, e.g. <script src='/signalr/js'></script>. at Object.start (jquery.signalR-2.4.0.min.js:9) at HTMLDocument.<anonymous> (Default.aspx:716) ....... hubs:1 Failed to load resource: net::ERR_CONNECTION_TIMED_OUT
$.connection.hub.start().done(function ()