generate qr code programmatically c# Part II in Visual C#

Draw QR Code ISO/IEC18004 in Visual C# Part II

Part II
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ASP.NET Pages and Server Controls
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The object returned by SaveViewState is received by LoadViewState, which extracts and assigns data back to the original objects.
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protected override void LoadViewState(object savedState) { if (savedState != null) { var t = (Triplet) savedState; base.LoadViewState(t.First); DataItem.LoadViewState(t.Second); TextStyle.LoadViewState(t.Third); } else { base.LoadViewState(null); } }
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The IStateManager implementation of LoadViewState on the serialized objects determines how each object (for example, styles and data items) restores its own data. Note that when DataItem.LoadViewState is called, the get accessor of DataItem is invoked and initializes the internal _dataItem member on the first call.
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Getting Bound Data
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In ASP.NET, a bound control obtains bound data through the PerformDataBinding method. Overriding this method is mandatory for any data-bound control because the standard implementation of the method does nothing. It is important to recall that the IEnumerable argument passed to PerformDataBinding represents the collection of bound data regardless of the format of the originally bound data source whether it is an ADO.NET object, collection, or data source control. Here s the implementation of PerformDataBinding for the GaugeBar control:
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protected override void PerformDataBinding(IEnumerable data) { // In this control, in spite of the IEnumerable type being used // the argument "data" is a single object, not a real list to enumerate. // You need to get an enumerator and call MoveNext once to get the effective // content to bind. if (data == null) return; var e = data.GetEnumerator(); e.MoveNext(); // Set default values for bindable properties float displayValue = 0; var displayText = String.Empty;
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// Read the value for the Value property if (!String.IsNullOrEmpty(DataValueField)) displayValue = (float) DataBinder.GetPropertyValue( e.Current, DataValueField); // Read the value for the FormatString property if (!String.IsNullOrEmpty(DataTextField)) displayText = (String) DataBinder.GetPropertyValue( e.Current, DataTextField); // Fill the DataItem property DataItem.Value = displayValue; DataItem.Text = displayText; }
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In this particular case, the IEnumerable object passed to PerformDataBinding contains just one element. The IEnumerable interface, though, doesn t distinguish between a single element or a list of elements. In other words, to get the data object you need to get the enumerator and move to the first item:
// data is of type IEnumerable IEnumerator e = data.GetEnumerator(); e.MoveNext(); // Use e.Current to get the physical data object
The e.Current expression returns the data object bound to the control that is, the container from which you extract the fields mapped to bindable properties. If you know the control is bound to, say, a DataRow object, you can retrieve the value for the Value property through the following code:
displayValue = ((DataRow) e.Current)[DataValueField];
Using the DataBinder class adds greater flexibility to your code and makes your code independent from the type of the bound data source. The GetPropertyValue method on the DataBinder class uses reflection to query the object to see whether it contains a public property with the specified name:
displayText = (string) DataBinder.GetPropertyValue( e.Current, DataTextField);
GetPropertyValue returns an object and requires a cast to the proper type.
Part II
ASP.NET Pages and Server Controls
The remaining step is updating the rendering engine so that it accesses the DataItem object whenever it requires bound data. The BuildLabel method shown next displays the descriptive text around the gauge:
void BuildLabel(TableCell container) { // Calculate the value to represent var valueToRepresent = GetValueToRepresent(); // Get the string to display on the label var msg = GetTextToRepresent(); var lbl = new Label(); if (container is TableCell) container.Controls.Add(lbl); else Controls.Add(lbl); lbl.Text = String.Format(msg, valueToRepresent, Maximum); }
The BuildLabel method adds a Label control to the control hierarchy under construction. The text displayed through the label is composed using the value and the format string of the gauge. Both Value and FormatString can be either data-bound or statically assigned. For this reason, you should use a get function that checks the current binding, if any, and returns the bound value or the assigned value. Note the bound value is returned in favor of an assigned value, if both are present.
float GetValueToRepresent() { float f = 0; if (DataItem.Value >=0) f = DataItem.Value; else f = Value; return f; } string GetTextToRepresent() { var msg = ""; if (!String.IsNullOrEmpty(DataItem.Text)) msg = DataItem.Text; else msg = FormatString; return msg; }
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