In sitecore, when getting the datasource from the renderingcontext, it returns a guid. Is there a means to convert this to the actual string value stored in the datasource field.
I want to run a "fast" query but need the path stored in the rendering context datasource instead of the guid.
Thanks,
If what you receive is a Guid, you can use
var idString = guid.ToString("B");
if what you receive is Sitecore.Data.ID, just use:
var idString = id.ToString();
The guid that you are getting is the Sitecore ID of the datasource item. You should be able to get it's path directly:
var dataSource = Sitecore.Context.Database.GetItem(RenderingContext.CurrentOrNull.Rendering.DataSource);
var dataSourcePath = dataSource.Paths.Path;
Related
I have an array defined using RxSwift as
public var calendarNDays = BehaviorRelay<[CalendarControlDayModel]>(value: [])
CalendarControlDayModel is a structure as below.
struct CalendarControlDayModel {
var date: String = ""
var day: Int = 0
var name: String = ""
}
Once the calendarNDays is updated with elements at some point of time I want to modify the name property of i-th element in the array.
Like self.calendarNDays.value[i].name = "Nancy". However, I get the compilation error "Cannot assign to property: 'value' is a get-only property".
What is the way to modify a particular property of an element in a behaviour relay array?
As the compiler suggests the value in BehaviorRelay is a read-only property.
Therefore in order to make changes to the array you first need to copy it and use the accept method to reflect the changes.
Similar to
var update = calendarNDays.value
update[i].name = “Nancy”
calendarNDays.accept(update)
I'm using Entity Framework 6 with ASP.Net MVC 5. When using a database context object, is there a way to use a variable for the table name, without having to manually write the query?
For example:
var tableName = "NameOfTable";
result = context.tableName.Find(...);
I know that particular code won't work, because tableName is not defined in context, but is there a way to achieve the desired effect?
There are some similar questions on this site, but they never really solved the problem and they were for earlier versions of entity framework, so I'm hoping that there is an answer now.
Here's a simple solution using a switch to associate a particular Type to a table. You could also maintain use some sort of Dictionary<string, Type> object.
var tableName = "Table1";
// Get proper return type.
Type returnType;
switch(tableName) {
case "Table1":
returnType = typeof(Table1EntityType);
break;
case "Table2":
returnType = typeof(Table2EntityType);
break;
}
var query = context.Set(returnType);
// Filter against "query" variable below...
var result = query.Where(...);
-or-
var tableName = "Table1";
Dictionary<string, Type> tableTypeDict = new Dictionary<string, Type>()
{
{ "Table1", Table1Type },
{ "Table2", Table2Type }
};
var query = context.Set(tableTypeDict[tableName]);
// Filter against "query" variable below...
var result = query.Where(...);
EDIT: Modified for Entity Framework
EDIT2: Use typeof per #thepirat000 's suggestion
In addition to the helpful answers above, I also want to add this in case it helps someone else.
If you are getting this error on the "Where" clause in Mark's answer:
'DbSet does not contain a definition for 'Where' and no acceptable extension method 'Where' accepting an argument of the type 'DbSet' could be found.
Installing the Nuget Package "System.Linq.Dynamic.Core" made the error disappear for us.
If you need to access the LINQ methods and the column names from the table, you can code something like this:
var tableName = "MyTableName";
var tableClassNameSpace = "MyProject.Models.EntityModels";
using (var dbContext = new MyEntities())
{
var tableClassName = $"{tableClassNameSpace}.{tableName}";
var dynamicTableType = Type.GetType(tableClassName); // Type
var dynamicTable = dbContext.Set(dynamicTableType); // DbSet
var records = dynamicTable
.AsQueryable()
.ToDynamicList()
.OrderBy(d => d.MyColumnName)
.Select(d => new { d.MyColumnName })
.ToList();
// do stuff
}
TempData["Amalgamation"] = SearchList;
I am using this code already in this TempData a record is there now i want to append new data which was stored in "SearchList". How can i do that?
Assuming SearchList is a List<T>
var searchList = (List<SomeType>)TempData["Amalgamation"];
searchList.Add(...);
I want fetch the details of a Collection in Odata services like the following URL
http://my.company.com/odata/Employee('1234')/Details
I tried with the following code to do so. Not sure whether fromEntityKey is the right thing to do or anything else.
manager = new breeze.EntityManager(collectionData.serviceName);
var empType = manager.metadataStore.getEntityType("Employees");
var entityKey = new EntityKey(empType, '1234');
var query = EntityQuery.fromEntityKey(entityKey);
But it gives me an error "Be sure to execute a query or call fetchMetadata first."
I also tried that from this link. But I'm still getting the same.
Can any one help me on this?
You can't use manager.metadataSote.getEntityType("Employees") until metadata has been retrieved from the server. By default this occurs during the first query operation, but your code is attempting to use the metadata before it has been retrieved.
Also, I think that you are confusing the name of your resource "Employees" with the type of the instances returned by your resource, probably "Employee". I would also check whether your key's datatype is numeric or a string. The example below assume its numeric (unlike your example where the datatype of the key is presumably a string because you are quoting it).
So you have two approaches, either force the metadata to be fetched before you compose your query, like this:
manager = new breeze.EntityManager(serviceName);
manager.fetchMetadata().then(function () {
var empType = manager.metadataStore.getEntityType("Employee");
var entityKey = new EntityKey(empType, 1);
var query = EntityQuery.fromEntityKey(entityKey);
// if you want to also see the queries details
query = query.expand("Details");
return manager.executeQuery(query);
}).then(function (data) {
var results = data.results;
ok(results.length === 1, "should have returned a single record");
var emp = results[0];
));
or if you know the string name of the 'key' ("Id" in the example below) field, use it directly
manager = new breeze.EntityManager(serviceName);
var query = EntityQuery.from("Employees")
.where("Id", "==", 1)
.expand("Details");
manager.executeQuery(query).then(function(data) {
var results = data.results;
var emp = results[0];
});
I just discovered a very strange behaviour. I have a class with a string property. In the setter of this property I compare the old value with the new value first and only change property if the values differ:
set
{
if ((object.ReferenceEquals(this.Identifier, value) != true))
{
this.Identifier = value;
this.RaisePropertyChanged("Identifier");
}
}
But this ReferenceEquals almost always returns false! Even if I call object.ReferenceEquals("test", "test") in Quick Watch I get false.
How is this possible?
That's because strings are immutable in C#:
The contents of a string object cannot
be changed after the object is
created, although the syntax makes it
appear as if you can do this.
Since you can't modify an existing string reference, there's no benefit in reusing them. The value passed to your property setter will always be a new string reference, except maybe if you do this.Identifier = this.Identifier;.
I'll try to clarify with an example:
string s = "Hello, "; // s contains a new string reference.
s += "world!"; // s now contains another string reference.