51 lines
1.8 KiB
C#
51 lines
1.8 KiB
C#
using System.Globalization;
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namespace System.Web.ModelBinding {
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/// <summary>
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/// This value provider supports single key-value lookup.
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/// SimpleValueProvider itself is unaware of actual look-up mechanism and delegates to child classes using the FetchValue method.
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/// Example simple value providers are ViewStateValueProvider and ControlValueProvider.
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/// </summary>
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public abstract class SimpleValueProvider : IValueProvider {
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private CultureInfo _cultureInfo;
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protected ModelBindingExecutionContext ModelBindingExecutionContext {
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get;
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private set;
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}
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protected SimpleValueProvider(ModelBindingExecutionContext modelBindingExecutionContext)
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: this(modelBindingExecutionContext, CultureInfo.CurrentCulture) {
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}
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protected SimpleValueProvider(ModelBindingExecutionContext modelBindingExecutionContext, CultureInfo cultureInfo) {
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ModelBindingExecutionContext = modelBindingExecutionContext;
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_cultureInfo = cultureInfo;
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}
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public virtual bool ContainsPrefix(string prefix) {
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if (prefix == null) {
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throw new ArgumentNullException("prefix");
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}
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return FetchValue(prefix) != null;
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}
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public virtual ValueProviderResult GetValue(string key) {
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if (key == null) {
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throw new ArgumentNullException("key");
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}
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object rawValue = FetchValue(key);
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if (rawValue == null) {
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return null;
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}
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string attemptedValue = Convert.ToString(rawValue, _cultureInfo);
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return new ValueProviderResult(rawValue, attemptedValue, _cultureInfo);
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}
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protected abstract object FetchValue(string key);
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}
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}
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