My stored procedure, instead of returning zero rows, returns one with most of the columns NULL. When my .Net code sees such data, I wish to force it to display the EmptyDataTemplate. How?
Thanks Win,
In the LinqDataSource Selecting event handler I check if the data source has a size of one and has a null value for one of the key fields and then I pass in this to the LinqDataSourceSelectEventArgs' Result:
using (var dataContext = new WebDataContext())
{
var report = from row in dataContext.GetReport()
select new Report()
{
AccountCode = row.AccountCode //,
//...
}
}
if (report.Count() == 1 && report.ToList()[0].AccountCode == null)
{
var emptyReport = report.ToList();
report.Clear();
e.Result = emptyReport;
}
else
{
//...
e.Result = matrixReport;
//...
}
Related
I am trying to grab multiple values from a checkboxlist and add them to a list, But checked values are always false even though the list contains appropriate count value.
code to populate:
Guid userGuid = (Guid)Membership.GetUser().ProviderUserKey;
HelpingOthersEntities helpData = new HelpingOthersEntities();
List<LookupStoreLocationsByUserName> theDataSet = helpData.LookupStoreLocationsByUserName(userGuid).ToList<LookupStoreLocationsByUserName>();
locCkBox.DataSource = theDataSet;
locCkBox.DataTextField = "slAddress";
locCkBox.DataValueField = "storeLocationID";
locCkBox.DataBind();
code for adding to list:
List<int> locList = new List<int>();
for (int x = 0; x < locCkBox.Items.Count; x++){
if(locCkBox.Items[x].Selected){
locList.Add(int.Parse(locCkBox.Items[x].Value));
}
}
The problem I am having is that I cannot get into items.selected
my value is always false.
I have tried populating the checkboxes from postback but i get the same result. My list gives me the appropriate .Count amount of values, but items.selected = false?
I have tried a foreach loop to add to list as well but I get the same results over and over. Am i missing an event or something?
I'm going to take a guess here and say that your code that does the population stuff is being called in the pageload event, so you have something like the following.
private void Page_Load()
{
Guid userGuid = (Guid)Membership.GetUser().ProviderUserKey;
HelpingOthersEntities helpData = new HelpingOthersEntities();
List<LookupStoreLocationsByUserName> theDataSet = helpData.LookupStoreLocationsByUserName(userGuid).ToList<LookupStoreLocationsByUserName>();
locCkBox.DataSource = theDataSet;
locCkBox.DataTextField = "slAddress";
locCkBox.DataValueField = "storeLocationID";
locCkBox.DataBind();
}
If that's the case then your effectively writing over the postback data on each request. To sort this out you need to only perform the databinding when its not a postback, so you need to change the above code to
private void Page_Load()
{
if (!IsPostBack)
{
Guid userGuid = (Guid)Membership.GetUser().ProviderUserKey;
HelpingOthersEntities helpData = new HelpingOthersEntities();
List<LookupStoreLocationsByUserName> theDataSet = helpData.LookupStoreLocationsByUserName(userGuid).ToList<LookupStoreLocationsByUserName>();
locCkBox.DataSource = theDataSet;
locCkBox.DataTextField = "slAddress";
locCkBox.DataValueField = "storeLocationID";
locCkBox.DataBind();
}
}
You should then be able to test the Selected property of the items. I'd also probably change the code your using to test for the selected to something like
List<int> locList = new List<int>();
foreach(var item in locCkBox.Items)
{
if(item.Selected)
{
locList.Add(int.Parse(item.Value));
}
}
or if your on a .NET version with LINQ available
List<int> locList = new List<int>();
(from item in locCkBox.Items where item.Selected == true select item).ForEach(i => locList.Add(i.Value));
Make sure while binding the checkboxlist in page load you have set this check.
if (!Page.IsPostBack)
{
...bind your data
}
This should do the trick.
My situation is like this:
I have a function that returns a value as SPListItemCollection and I bind this function to a repeater.
My problem is how can I do some conditional formatting before the return value?
SPListItemCollection GetListItems()
{
SPWeb curWeb = SPContext.Current.Site.RootWeb;
string siteUrl = SPContext.Current.Web.Url;
SPListItemCollection curItems = GetDep(ListName, department);
// write condition here so that it checks if the item count is higher or
//lower than a specified number.
return curItems;
}
thank you for your help.
Im not 100% sure what you want to do before the return. If you only want to check if the resultItem.Count is bigger then 100 for example, you can do this:
SPListItemCollection GetListItems()
{
SPWeb curWeb = SPContext.Current.Site.RootWeb;
string siteUrl = SPContext.Current.Web.Url;
SPListItemCollection curItems = GetDep(ListName, department);
if (curItems.Count > 100)
{
// change the items or do whatever you want. after that, return:
foreach(SPListItem item in curItems)
{
//format/change
}
return curItems;
}
// return, without any changes
return curItems;
}
Try smth like
SPListItemCollection GetListItems()
{
SPWeb curWeb = SPContext.Current.Site.RootWeb;
string siteUrl = SPContext.Current.Web.Url;
SPListItemCollection curItems = GetDep(ListName, department);
var itemsForDepartment = curItems.GetDataTable().Rows.Where(r => r["Department"] == department); // you can try to do this is caml too
if(itemsForDepartment.Count > itemCount) {
// insert the "show me more" link
}
var itemsForDepartment = itemsForDepartment.Take(itemCount);
// bind itemsForDepartment to a Repeater
return curItems;
}
I have not compiled this code so you will have to correct some syntax mistakes ;)
I've got data returned from my JavaScript client that just includes the data that has changed. That is, I may have an array with each row containing 10 columns of JSON downloaded, but on the Update, only the data that is returned to me is the data that got updated. On my update, I only want to update those columns that are changed (not all of them).
In other words, I have code like below but because I'm passing in an instance of the "President" class, I have no way of knowing what actually came in on the original JSON.
How can I just update what comes into my MVC3 update method and not all columns. That is, 8 of the columns may not come in and will be null in the "data" parameter passed in. I don't want to wipe out all my data because of that.
[HttpPost]
public JsonResult Update(President data)
{
bool success = false;
string message = "no record found";
if (data != null && data.Id > 0)
{
using (var db = new USPresidentsDb())
{
var rec = db.Presidents.FirstOrDefault(a => a.Id == data.Id);
rec.FirstName = data.FirstName;
db.SaveChanges();
success = true;
message = "Update method called successfully";
}
}
return Json(new
{
data,
success,
message
});
}
rec.FirstName = data.FirstName ?? rec.FirstName;
I would use reflection in this case because the code will be too messy like
if (data.FirstName != null)
rec.FirstName = data.FirstName
.
.
.
and so on for all the fields
Using reflection, it would be easier to do this. See this method
public static void CopyOnlyModifiedData<T>(T source, ref T destination)
{
foreach (var propertyInfo in source.GetType().GetProperties())
{
object value = propertyInfo.GetValue(source, null);
if (value!= null && !value.GetType().IsValueType)
{
destination.GetType().GetProperty(propertyInfo.Name, value.GetType()).SetValue(destination, value, null);
}
}
}
USAGE
CopyOnlyModifiedData<President>(data, ref rec);
Please mind that, this won't work for value type properties.
I am developing a custom control that needs to display a dropdownlist as a composite control.
The drop down list gets populated from a Rest web service. The problem I am facing is that the dropdownlist only has DataTextField and DataValueField but I need a way of storing more values in the control i.e. I have a couple of other properties I need to access for the selected item.
What is the best way of going about this?
Here is the code I have so far:
[ValidationProperty("SelectedValue")]
public class SelectSurveyControl : Panel
{
private DropDownList ddlSurveys;
public string SelectedSurveyId
{
get
{
return SelectedValue;
}
}
public string SelectedSurveyJavascriptEmbedCode
{
get
{
return this.ddlSurveys.SelectedItem.Attributes[""];
}
}
public string SelectedValue
{
get
{
return ddlSurveys.SelectedValue;
}
set
{
if (ddlSurveys == null)
{
ddlSurveys = new DropDownList();
}
ddlSurveys.SelectedValue = value;
}
}
protected override void OnLoad(EventArgs e)
{
base.OnInit(e);
if (ddlSurveys == null)
{
ddlSurveys = new DropDownList();
}
IList<Survey> surveys = GetSurveys();
this.ddlSurveys.DataSource = surveys;
this.ddlSurveys.DataTextField = "title";
this.ddlSurveys.DataValueField = "id";
this.ddlSurveys.DataBind();
ddlSurveys.SelectedValue = this.SelectedValue;
ddlSurveys.CssClass = "umbEditorTextFieldMultiple charlimit";
ddlSurveys.Attributes.Add("SurveyId", SelectedSurveyId);
ddlSurveys.Attributes.Add("JavascriptEmbedingCode", SelectedSurveyId);
this.Controls.Add(ddlSurveys);
}
public IList<Survey> GetSurveys()
{
...
}
}
Try using a string join/split to store and retrieve the various values, then you don't have to customize your dropdown list very much.
For Example:
Text: Some Title
Value: 1|testing test|2/12/2010
This will let you store as many values as you want, so long as you choose an appropriate character to join and split on. I usually use the bar, as in my example above.
Side Note: I was looking at your selected value set handler and it needs some tweaking. You shouldn't check for a null drop down list, instead you should call EnsureChildControls() before each get and set instead. Make sure you override the CreateChildControls() method and create your controls there.
You could use a hidden field and iterate thru a copy of the returned Surveys like this:
foreach(Survey s in Surveys){
string val = s.id + ":" + s.<property1> + ":" + s.<property2>;
hiddenField.Value += val +",";
}
When you need to read from the hidden field, you use String.Split to separate the values into arrays using ',' as the separator and in each array, you split again using ':'.
In the first split Array1[0] who be the survey id and Array1[n!=0] would be the properties of the Survey with the id = Array1[0]. Array[n!=0] would then be split into Array2.
I would suggest handling empty property values with an empty string or something or else you might end up with unequal lengths especially if you specify StringSplitOptions.RemoveEmptyEntries.
Agricfowl
I have a Silverlight 3 tools library with a custom DataGrid user control. This grid has no direct access to the WCF RIA Services entity types so I'm using reflection to add a new item when the user clicks on the grid when it's empty:
private void InsertEmptyRecord()
{
if (this._dataGrid.ItemsSource == null)
return;
Type[] typeParameters = this._dataGrid.ItemsSource.GetType().GetGenericArguments();
if (typeParameters.Count() > 0)
{
Type itemType = typeParameters[0];
object newItem = System.Activator.CreateInstance(itemType);
Type sourceType = typeof(System.Windows.Ria.EntityCollection<>);
Type genericType = sourceType.MakeGenericType(itemType);
System.Reflection.MethodInfo addMethod = genericType.GetMethod("Add");
addMethod.Invoke(this._dataGrid.ItemsSource, new object[] { newItem });
// == Validate data here ==
}
}
This works, but I need it to also validate after the new item is added. There are two ways I can see to do this:
Force the user to enter edit mode
for the first cell of the new row in
the grid. (This would force
validation if they click anywhere
else on the page.)
Force validations
to run immediately when the new row
is added (or when the grid looses
focus.)
I haven't been able to get either of these to work. Tried this but it only selects the row, doesn't force the validations to run:
this._dataGrid.SelectedItem = newItem;
System.ComponentModel.IEditableObject editableItem = newItem as System.ComponentModel.IEditableObject;
if (editableItem != null)
editableItem.BeginEdit();
Any suggestions?
Just got this working thanks to some help from this question.
I added the following to the "== Validate data here ==" section in the code from above:
DataGridRow newRow = this._dataGrid.ChildrenOfType<DataGridRow>().FirstOrDefault();
if (newRow != null)
{
newRow.Loaded += (sender, e) =>
{
this._dataGrid.CurrentItem = newItem;
this._dataGrid.BeginEdit();
};
}
This forces the first cell to immediately go into edit mode.