culture Setting these values can occur in one of two ways: implicitly or explicitly in VS .NET

Generator EAN / UCC - 13 in VS .NET culture Setting these values can occur in one of two ways: implicitly or explicitly
culture Setting these values can occur in one of two ways: implicitly or explicitly
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Implicitly Setting the Current Culture
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Implicitly setting the current culture means that ASPNET uses a value passed in by the browser to automatically set the current culture The browser passes in the languages it supports using the Accept-Language header, as shown in Figure 62
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Figure 62 Fiddler view of a request s Accept-Language header
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In a default browser installation, the Accept-Language header value is set based on the installation language you choose or the language your operating system is running under However, you also have the option of modifying it manually by altering the language preference within the browser Altering the language preference within the browser will change which values are passed in with the Accept-Language header Figure 63 shows the Accept-Language header for our request after we altered our browser s language setting to use English (Other Culture) [en-OC], a ctitious culture we re using as an example, English (Great Britain) [en-GB], and Arabic (Oman) [ar-OM]
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Figure 63 Fiddler s view of a request s Accept-Language header with multiple languages specified
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When we provide multiple languages in the Accept-Language header, the browser sends along a quality value attached to each language The quality values, indicated by the q= that proceeds each culture, can range from the high of 1 to the low of 0 The quality value tells the request receiver, in this case ASPNET, which language to try rst In our example, the highest quality value is 1, which is associated to the en-OC culture (a blank quality value indicates 1), so this is the culture that ASPNET will try rst If ASPNET fails to create a CultureInfo object based on that value because it either isn t supported, which is the case because en-OC is a ctitious culture, or for some other reason, it moves on to the next culture based on the quality value In our case, this is en-US, which has the quality value 8 If that culture fails, too, ASPNET tries en-GB and then ar-OM If all cultures fail, ASPNET defaults to the server s culture
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Setting the Language Preference
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Setting the browser s language preference is different with each browser, but in most of them the preference is available under an options screen
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Explicitly Setting the Current Culture
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In most applications, we want to provide a way for the user to override the implicit culture de ned by the user s browser language preference We do this because our users may want to run our application under a different culture, but not have that culture applied to every website they visit, which is what would happen if they alter their browser s settings We can provide
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this ability by providing a way for users to explicitly set the culture of just our application Let s alter our Transactions page to provide a way to set the culture the request is running under We start by adding a drop-down to our page that allows the user to select the current culture, as shown in Figure 64
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Figure 64 Transactions page with culture selector
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Whereas our culture drop-down displays friendly values, the values corresponding to each drop-down item are the actual culture codes The markup that speci es the drop-down s list items is displayed in Listing 66
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Listing 66 Select Culture Drop-Down
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<form id="form1" runat="server"> <div id="CultureSelector" style="position: absolute; left: 610px;"> <asp:Label ID="SelectCultureLabel" runat="server" Text="Select Culture" /> <br /> <asp:DropDownList ID="CultureSelectorDropDown" runat="server" AutoPostBack="True"> <asp:ListItem Text="English / United States" Value="en-us" /> <asp:ListItem Text="Spanish / Mexico" Value="es-mx" />
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<asp:ListItem Text="French" Value="fr" /> </asp:DropDownList> </div> <div id="TransactionPanel" style="position: absolute; top: 50px;">
Now that we have our drop-down on the page, we need to change the thread s current culture based on the drop-down s selected value In our example, we do this by overriding the page s InitializeCulture method, as shown in Listing 67
Listing 67 InitializeCulture Method Override
protected override void InitializeCulture() { baseInitializeCulture(); if (RequestForm["CultureSelectorDropDown"] != null) { CultureInfo newCulture = CultureInfoCreateSpecificCulture( RequestForm["CultureSelectorDropDown"] ); // enables different culture info //(date formats, currency formats) ThreadCurrentThreadCurrentCulture = newCulture; // enables different resource files // (ie resourceses-mxresx) ThreadCurrentThreadCurrentUICulture = newCulture; } }
In this InitializeCulture override, we pull the value posted back by the drop-down out of the request s form collection and create a new CultureInfo object based on the value We then take our new CultureInfo object and assign it to the current thread s CurrentCulture and Current UICulture properties, effectively changing the culture the thread is running on