Bueno amigos les quiero pedir su ayuda lo que pasa que tengo un codigo para personalizar un gridview y que soporta un array de objetos para desplegarlos en un gridview, el cual es el siguiente:
Código PHP:
namespace CustomControls
{
public class GridViewEx : GridView
{
#region Array Comparer
private class ArrayComparer : IComparer
{
private string sortedPropertyName = null;
private SortDirection sortDirection = SortDirection.Ascending;
public ArrayComparer(string sortedPropertyName, SortDirection sortDirection)
{
this.sortedPropertyName = sortedPropertyName;
this.sortDirection = sortDirection;
}
#region IComparer Members
public int Compare(object x, object y)
{
PropertyInfo prop = x.GetType().GetProperty(sortedPropertyName);
if (prop == null)
throw new Exception(string.Format("Incorrect property to sort: {0}", sortedPropertyName));
object xValue = prop.GetValue(x, null);
object yValue = prop.GetValue(y, null);
if (xValue == null || yValue == null)
throw new Exception(string.Format("Failed to sort by {0}", sortedPropertyName));
if (sortDirection == SortDirection.Ascending)
return ((IComparable)xValue).CompareTo(((IComparable)yValue));
else
return ((IComparable)yValue).CompareTo(((IComparable)xValue));
}
#endregion
}
#endregion
#region Event Handlers
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
this.Sorting += new GridViewSortEventHandler(GridViewEx_Sorting);
this.PageIndexChanging += new GridViewPageEventHandler(GridViewEx_PageIndexChanging);
}
void GridViewEx_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
this.PageIndex = e.NewPageIndex;
BindDataSource();
}
void GridViewEx_Sorting(object sender, GridViewSortEventArgs e)
{
if (PrevSortExpression == e.SortExpression)
{
e.SortDirection = SortDirection.Descending;
PrevSortExpression = null;
}
else
PrevSortExpression = e.SortExpression;
CurrentSortExpression = e.SortExpression;
CurrentSortDirection = e.SortDirection;
ChangeHeaders(this.HeaderRow);
BindDataSource();
}
#endregion
#region Private
private void ChangeHeaders(GridViewRow headerRow)
{
for (int i = 0; i < headerRow.Cells.Count; i++)
{
if (headerRow.Cells[i] is DataControlFieldCell)
{
DataControlField field = ((DataControlFieldCell)headerRow.Cells[i]).ContainingField;
Regex r = new Regex(@"\s(\u25bc|\u25b2)");
field.HeaderText = r.Replace(field.HeaderText, "");
if (field.SortExpression != null && field.SortExpression == CurrentSortExpression)
{
if (CurrentSortDirection == SortDirection.Ascending)
field.HeaderText += " \u25b2";
else
field.HeaderText += " \u25bc";
}
}
}
}
private string PrevSortExpression
{
get
{
if (ViewState["PrevSortExpression"] == null)
return null;
return (string)ViewState["PrevSortExpression"];
}
set
{
ViewState["PrevSortExpression"] = value;
}
}
private string CurrentSortExpression
{
get
{
if (ViewState["CurrentSortExpression"] == null)
return null;
return (string)ViewState["CurrentSortExpression"];
}
set
{
ViewState["CurrentSortExpression"] = value;
}
}
private SortDirection CurrentSortDirection
{
get
{
if (ViewState["CurrentSortDirection"] == null)
return SortDirection.Ascending;
return (SortDirection)ViewState["CurrentSortDirection"];
}
set
{
ViewState["CurrentSortDirection"] = value;
}
}
#endregion
#region Public
/// <summary>
/// Binds the data source to the GridView control.
/// </summary>
public void BindDataSource()
{
Array dataSource = null;
if (DataSourceRequested != null)
DataSourceRequested(out dataSource);
if (dataSource == null)
throw new Exception("Failed to get data source.");
if (CurrentSortExpression != null)
{
ArrayList ar = new ArrayList(dataSource);
ar.Sort(new ArrayComparer(CurrentSortExpression, CurrentSortDirection));
dataSource = ar.ToArray();
}
base.DataSource = dataSource;
base.DataBind();
}
/// <summary>
/// Occurs when the data source is requested.
/// </summary>
public event DataSourceRequestedEventHandler DataSourceRequested;
#endregion
}
/// <summary>
/// Represents the method that handles the DataSourceRequested event of a GridView control.
/// </summary>
/// <param name="dataSource">Array of the objects.</param>
public delegate void DataSourceRequestedEventHandler(out Array dataSource);
}
y su utilización:
Código PHP:
#region Event Handlers
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
gv.BindDataSource();
}
protected void gv_DataSourceRequested(out Array dataSource)
{
dataSource = GetTestData();
}
#endregion
#region Private
private ProductInfo[] GetTestData()
{
ProductInfo[] res = new ProductInfo[8];
res[0] = new ProductInfo("TV-Tuner", 1, 40.00);
res[1] = new ProductInfo("Modem", 2, 19.00);
res[2] = new ProductInfo("Motherbord", 1, 120.00);
res[3] = new ProductInfo("Keyboard", 18, 5.00);
res[4] = new ProductInfo("Mouse", 25, 4.99);
res[5] = new ProductInfo("Mouse pad", 30, 1.50);
res[6] = new ProductInfo("Monitor", 4, 234.00);
res[7] = new ProductInfo("Fan", 10, 8.00);
return res;
}
#endregion
ahora la idea es que se pueda trabajar con collections.Generics, lo he intentado de hacer pero no he logrado que funcione por eso recurro a ustedes para que por ultimo entre todos lo intentemos de hacer.... y para que no se crea que quiero que me hagan la pega aca un ejemplo de lo que he intentado hacer jejeeje....
Código PHP:
#region Event Handlers
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
gv.BindDataSource();
}
protected void gv_DataSourceRequested(out List<ProductInfo> dataSource)
{
dataSource = GetTestData();
}
#endregion
#region Private
private ProductInfoCollection<ProductInfo> GetTestData()
{
ProductInfoCollection<ProductInfo> res = new ProductInfoCollection<ProductInfo>();
res.Add(new ProductInfo("TV-Tuner", 1, 40.00));
res.Add(new ProductInfo("Modem", 2, 19.00));
res.Add(new ProductInfo("Motherbord", 1, 120.00));
res.Add(new ProductInfo("Keyboard", 18, 5.00));
res.Add(new ProductInfo("Mouse", 25, 4.99));
res.Add(new ProductInfo("Mouse pad", 30, 1.50));
res.Add(new ProductInfo("Monitor", 4, 234.00));
res.Add(new ProductInfo("Fan", 10, 8.00));
return res;
}
#endregion
bueno de la otra parte del codigo estoy es lo unico que tengo la implementacion del IComparer con Generics:
Código PHP:
#region Generic Comparer
public class GenericComparer<T> : IComparer<T>
{
private string sortExpression;
private SortDirection sortDirection;
public SortDirection SortDirection
{
get { return this.sortDirection; }
set { this.sortDirection = value; }
}
public GenericComparer() { }
public GenericComparer(string sortExpression, SortDirection sortDirection)
{
this.sortExpression = sortExpression;
this.sortDirection = sortDirection;
}
#region IComparer Members
public int Compare(T x, T y)
{
PropertyInfo propertyInfo = typeof(T).GetProperty(sortExpression);
IComparable obj1 = (IComparable)propertyInfo.GetValue(x, null);
IComparable obj2 = (IComparable)propertyInfo.GetValue(y, null);
if (SortDirection == SortDirection.Ascending)
{
return obj1.CompareTo(obj2);
}
else return obj2.CompareTo(obj1);
}
#endregion
}
#endregion
Bueno esperando que me puedan ayudar, de antemano graxxxxx :D