ASP.NET Cache的一些总结分享

 
<!-- Adds OutputCache directive --> 
<%@ OutputCache Duration="23" VaryByParam="None" %> 

 
<!-- Sets client OutputCache --> 
<%@ OutputCache Duration="23" VaryByParam="None" Location="Client" %> 

 
protected void Page_Load(object sender, EventArgs e) 
{ 
if (!Page.IsPostBack) 
{ 
// Gets product id from table Production.Product. 
// Then binding data to drop down list control. 
InitControl(GetProductId()); 
} 
} 
/// <summary> 
/// Handles the Click event of the btnSubmit control. 
/// Redirects to relative product information page. 
/// </summary> 
protected void btnSubmit_Click(object sender, EventArgs e) 
{ 
Response.Redirect(string.Format("Product.aspx?productname={0}", ddlProductName.SelectedValue)); 
} 

 
protected void Page_Load(object sender, EventArgs e) 
{ 
// Get product name. 
string productName = Request.QueryString["productname"]; // Binding data to data grid view control. 
InitControl(this.GetData(productName)); 
} /// <summary> 
/// Inits the control. 
/// </summary> 
/// <param name="ds">The dataset.</param> 
private void InitControl(DataSet ds) 
{ 
dgvProduct.DataSource = ds; 
dgvProduct.DataBind(); 
} /// <summary> 
/// Gets the data. 
/// </summary> 
/// <param name="productName">Name of the product.</param> 
/// <returns>Returns dataset</returns> 
private DataSet GetData(string productName) 
{ 
// The query sql base on product name. 
string sql = 
string.Format( 
"SELECT Name, ProductNumber, SafetyStockLevel, ReorderPoint, StandardCost, DaysToManufacture " 
+ "FROM Production.Product WHERE ProductNumber='{0}'", 
productName); // Get data from table Production.Product. 
using (var con = new SqlConnection(ConfigurationManager.ConnectionStrings["SQLCONN"].ToString())) 
using (var com = new SqlCommand(sql, con)) 
{ 
com.Connection.Open(); 
////gdvData.DataSource = com.ExecuteReader(); 
////gdvData.DataBind(); 
var ada = new SqlDataAdapter(com); 
var ds = new DataSet(); 
ada.Fill(ds); 
return ds; 
} 
} 

 
<!-- Adds OutputCache directive --> 
<%@ OutputCache Duration="30" VaryByParam="None" %> 

 
<!-- Sets VaryByParam property--> 
<%@ OutputCache Duration="30" VaryByParam="productname" %> 

 
/// <summary> 
/// Gets vary cache based on custom string value. 
/// </summary> 
/// <param name="context">Http context.</param> 
/// <param name="custom">custom string</param> 
/// <returns></returns> 
public override string GetVaryByCustomString(HttpContext context, string custom) 
{ 
if (string.Equals(custom, "UserHostName", StringComparison.OrdinalIgnoreCase)) 
{ 
// Indicates that the cache should be vary on user host name. 
return Context.Request.UserHostName; 
} 
return base.GetVaryByCustomString(context, custom); 
} 

 
<!-- set vary cache based on custom string value --> 
<%@ OutputCache Duration="30" VaryByParam="None" VaryByCustom="UserHostName" %> 

 
<caching> 
<!-- Sets out put cache profile--> 
<outputCacheSettings> 
<outputCacheProfiles> 
<add name="ProductCacheProfile" duration="30"/> 
</outputCacheProfiles> 
</outputCacheSettings> 
</caching>现在，我们在页面中添加CacheProfile属性，并且设置为ProductCacheProfile，如下所示： 

 
<!-- set CacheProfile property --> 
<%@ OutputCache CacheProfile="ProductCacheProfile" VaryByParam="None" %> 

 
<!-- The product number datasource START --> 
<asp:SqlDataSource ID="sourceProductName" runat="server" ProviderName="System.Data.SqlClient" 
EnableCaching="True" CacheDuration="3600" ConnectionString="<%$ ConnectionStrings:SQLCONN %>" 
SelectCommand="SELECT ProductNumber FROM Production.Product"></asp:SqlDataSource> 
<!-- The product number datasource END --> <!-- The product datasource START --> 
<asp:SqlDataSource ID="sourceProduct" runat="server" ProviderName="System.Data.SqlClient" 
EnableCaching="True" CacheDuration="3600" ConnectionString="<%$ ConnectionStrings:SQLCONN %>" 
SelectCommand="SELECT Name, ProductNumber, SafetyStockLevel, ReorderPoint, StandardCost, DaysToManufacture 
FROM Production.Product WHERE ProductNumber=@ProductNumber"> 
<SelectParameters> 
<asp:ControlParameter ControlID="ddlProductNumber" Name="ProductNumber" PropertyName="SelectedValue" /> 
</SelectParameters> 
</asp:SqlDataSource> 
<!-- The product number datasource END --> <!-- Binding the product number to gridview control --> 
<!-- NOTE: Due to search and result in the same page, so need to set AutoPostBack is True--> 
<asp:DropDownList ID="ddlProductNumber" AutoPostBack="True" DataSourceID="sourceProductName" 
DataTextField="ProductNumber" runat="server"> 
</asp:DropDownList> <!-- Binding the product datasource to gridview control --> 
<asp:GridView ID="gvProduct" runat="server" DataSourceID="sourceProduct" CssClass="Product"> 
</asp:GridView> 

 
// Creates cache object Key1. 
Cache["Key1"] = "Cache Item 1"; // Makes Cache["Key2"] dependent on Cache["Key1"]. 
string[] dependencyKey = new string[1]; 
dependencyKey[0] = "Key1"; // Creates a CacheDependency object. 
CacheDependency dependency = new CacheDependency(null, dependencyKey); // Establishs dependency between cache Key1 and Key2. 
Cache.Insert("Key2", "Cache Item 2", dependency); 

 
/// <summary> 
/// Caches the data into text file. 
/// </summary> 
/// <param name="context">The http context</param> 
private void CacheData(HttpContext context) 
{ 
// Weibo API. 
string uri = context.Request.QueryString["api"] + "?" + 
"source=" + context.Request.QueryString["source"] + "&" + 
"count=" + context.Request.QueryString["count"]; 
HttpWebResponse response = this.GetWeibos(uri); 
if (null == response) 
{ 
throw new ArgumentNullException("Response is null"); 
} 
string jsonData; 
// Writes the reponse data into text file. 
using (var reader = new StreamReader(response.GetResponseStream(), Encoding.GetEncoding(response.CharacterSet))) 
{ 
jsonData = reader.ReadToEnd(); 
} 
string dataPath = context.Server.MapPath("weibo.json"); 
using (var writer = new StreamWriter(dataPath, false, Encoding.GetEncoding(response.CharacterSet))) 
{ 
writer.Write(jsonData); 
} 
// Establishs dependency between cache weibo and text file. 
// Sets cache expires after 2 minuntes. 
HttpRuntime.Cache.Insert("weibo", jsonData, Dep, Cache.NoAbsoluteExpiration, TimeSpan.FromMinutes(2)); 
} 

 
/// <summary> 
/// Responses the weibo data. 
/// </summary> 
/// <param name="context">The http contex.</param> 
private void ResponseWeibo(HttpContext context) 
{ 
// Gets the weibo cache data. 
byte[] buf = Encoding.UTF8.GetBytes(HttpRuntime.Cache["weibo"].ToString()); 
// Writes the data into output stream. 
context.Response.OutputStream.Write(buf, 0, buf.Length); 
context.Response.OutputStream.Flush(); 
////context.Response.Close(); 
} 

 
// The function to get weibo data. 
loadWeibo: function() { 
$.ajax({ 
// Weibo API. 
url: "WeiboHandler.ashx", 
type: "GET", 
// NOTE: We get the data from same domain, 
// dataType is json. 
dataType: "json", 
data: { 
source: JQWeibo.appKey, 
count: JQWeibo.numWeibo 
}, 
// When the requet completed, then invokes success function. 
success: function(data, textStatus, xhr) { 
// Sets html structure. 
var html = 
'<div class="weibo">' + 
'<a rel="nofollow noopener noreferrer" href="http://weibo.com/DOMAIN" target="_blank">USER</a>' + 
'：WEIBO_TEXT<div class="time">AGO</div>'; 
// Appends weibos into html page. 
for (var i = 0; i < data.length; i++) { 
$(JQWeibo.appendTo).append( 
html.replace('WEIBO_TEXT', JQWeibo.ify.clean(data[i].text)) 
// Uses regex and declare DOMAIN as global, if found replace all. 
.replace(/DOMAIN/g, data[i].user.domain) 
.replace(/USER/g, data[i].user.screen_name) 
.replace('AGO', JQWeibo.timeAgo(data[i].created_at)) 
); 
} 
} 
}) 
} 

到此这篇关于ASP.NET Cache的一些总结分享就介绍到这了。一善升起，万恶俱下。善如萤火，聚集多了，一样可以照明驱暗。更多相关ASP.NET Cache的一些总结分享内容请查看相关栏目，小编编辑不易，再次感谢大家的支持！