Retrieve data from database and return into text box using Entity Framework
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}
using (var db = new CrabContext())
{
var query = db.Reading.Select(s => new
{ s.Left1 })
.Select(x => x.ToString());
t1.Text = query;
//t1.Text == db.Reading.Select(s => new { s.Left1 });
}
I am here trying to retrieve data from database as per mentioned above but my t1.Text is not able to retrieve the data yet I get an error like
Can't implicitly convert type 'System.Linq.IQueryable ' to 'String'
c# database entity-framework uwp
edited Nov 16 '18 at 18:00
marc_s
585k13011251272
asked Nov 16 '18 at 15:32
Zent TanZent Tan
97
add a comment |
using (var db = new CrabContext())
{
var query = db.Reading.Select(s => new
{ s.Left1 })
.Select(x => x.ToString());
t1.Text = query;
//t1.Text == db.Reading.Select(s => new { s.Left1 });
}
I am here trying to retrieve data from database as per mentioned above but my t1.Text is not able to retrieve the data yet I get an error like
Can't implicitly convert type 'System.Linq.IQueryable ' to 'String'
c# database entity-framework uwp
edited Nov 16 '18 at 18:00
marc_s
585k13011251272
asked Nov 16 '18 at 15:32
Zent TanZent Tan
97
add a comment |
using (var db = new CrabContext())
{
var query = db.Reading.Select(s => new
{ s.Left1 })
.Select(x => x.ToString());
t1.Text = query;
//t1.Text == db.Reading.Select(s => new { s.Left1 });
}
I am here trying to retrieve data from database as per mentioned above but my t1.Text is not able to retrieve the data yet I get an error like
Can't implicitly convert type 'System.Linq.IQueryable ' to 'String'
c# database entity-framework uwp
edited Nov 16 '18 at 18:00
marc_s
585k13011251272
asked Nov 16 '18 at 15:32
Zent TanZent Tan
97
using (var db = new CrabContext())
{
var query = db.Reading.Select(s => new
{ s.Left1 })
.Select(x => x.ToString());
t1.Text = query;
//t1.Text == db.Reading.Select(s => new { s.Left1 });
}
I am here trying to retrieve data from database as per mentioned above but my t1.Text is not able to retrieve the data yet I get an error like
Can't implicitly convert type 'System.Linq.IQueryable ' to 'String'
c# database entity-framework uwp
c# database entity-framework uwp
edited Nov 16 '18 at 18:00
marc_s
585k13011251272
asked Nov 16 '18 at 15:32
Zent TanZent Tan
97
edited Nov 16 '18 at 18:00
marc_s
585k13011251272
asked Nov 16 '18 at 15:32
Zent TanZent Tan
97
edited Nov 16 '18 at 18:00
marc_s
585k13011251272
edited Nov 16 '18 at 18:00
marc_s
585k13011251272
edited Nov 16 '18 at 18:00
marc_s
585k13011251272
585k13011251272
asked Nov 16 '18 at 15:32
Zent TanZent Tan
97
asked Nov 16 '18 at 15:32
Zent TanZent Tan
97
asked Nov 16 '18 at 15:32
Zent TanZent Tan
97
97
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
It's because the .Select() returns an IQueryable, an IQueryable is not accessible because the type of the data is not specified so it's only accessible when compiling, if you want to have the value directly prefer to use FirstOrDefault you can pass a lambda expression inside to retrieve a specific object.
using (var db = new CrabContext())
{
var query = db.Reading.FirstOrDefault();
t1.Text = query.Left1;
}
But with the solution I provide the call make to the Db is SELECT * FROM Reading and then you access the property Left1
With IQueryable the query is SELECT Left1 FROM Reading but you can't access the property...
Another solution will be to call .toList() at the end of your query...
edited Nov 16 '18 at 16:10
mxmissile
7,92734170
answered Nov 16 '18 at 15:56
MaxMax
27715
1
If you're usingFirstOrDefault, then it's better to includenullchecking so that OP would understand that.
– JohnyL
Nov 16 '18 at 18:57
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
It's because the .Select() returns an IQueryable, an IQueryable is not accessible because the type of the data is not specified so it's only accessible when compiling, if you want to have the value directly prefer to use FirstOrDefault you can pass a lambda expression inside to retrieve a specific object.
using (var db = new CrabContext())
{
var query = db.Reading.FirstOrDefault();
t1.Text = query.Left1;
}
But with the solution I provide the call make to the Db is SELECT * FROM Reading and then you access the property Left1
With IQueryable the query is SELECT Left1 FROM Reading but you can't access the property...
Another solution will be to call .toList() at the end of your query...
edited Nov 16 '18 at 16:10
mxmissile
7,92734170
answered Nov 16 '18 at 15:56
MaxMax
27715
1
If you're usingFirstOrDefault, then it's better to includenullchecking so that OP would understand that.
– JohnyL
Nov 16 '18 at 18:57
add a comment |
It's because the .Select() returns an IQueryable, an IQueryable is not accessible because the type of the data is not specified so it's only accessible when compiling, if you want to have the value directly prefer to use FirstOrDefault you can pass a lambda expression inside to retrieve a specific object.
using (var db = new CrabContext())
{
var query = db.Reading.FirstOrDefault();
t1.Text = query.Left1;
}
But with the solution I provide the call make to the Db is SELECT * FROM Reading and then you access the property Left1
With IQueryable the query is SELECT Left1 FROM Reading but you can't access the property...
Another solution will be to call .toList() at the end of your query...
edited Nov 16 '18 at 16:10
mxmissile
7,92734170
answered Nov 16 '18 at 15:56
MaxMax
27715
1
If you're usingFirstOrDefault, then it's better to includenullchecking so that OP would understand that.
– JohnyL
Nov 16 '18 at 18:57
add a comment |
It's because the .Select() returns an IQueryable, an IQueryable is not accessible because the type of the data is not specified so it's only accessible when compiling, if you want to have the value directly prefer to use FirstOrDefault you can pass a lambda expression inside to retrieve a specific object.
using (var db = new CrabContext())
{
var query = db.Reading.FirstOrDefault();
t1.Text = query.Left1;
}
But with the solution I provide the call make to the Db is SELECT * FROM Reading and then you access the property Left1
With IQueryable the query is SELECT Left1 FROM Reading but you can't access the property...
Another solution will be to call .toList() at the end of your query...
edited Nov 16 '18 at 16:10
mxmissile
7,92734170
answered Nov 16 '18 at 15:56
MaxMax
27715
It's because the .Select() returns an IQueryable, an IQueryable is not accessible because the type of the data is not specified so it's only accessible when compiling, if you want to have the value directly prefer to use FirstOrDefault you can pass a lambda expression inside to retrieve a specific object.
using (var db = new CrabContext())
{
var query = db.Reading.FirstOrDefault();
t1.Text = query.Left1;
}
But with the solution I provide the call make to the Db is SELECT * FROM Reading and then you access the property Left1
With IQueryable the query is SELECT Left1 FROM Reading but you can't access the property...
Another solution will be to call .toList() at the end of your query...
edited Nov 16 '18 at 16:10
mxmissile
7,92734170
answered Nov 16 '18 at 15:56
MaxMax
27715
edited Nov 16 '18 at 16:10
mxmissile
7,92734170
edited Nov 16 '18 at 16:10
mxmissile
7,92734170
edited Nov 16 '18 at 16:10
mxmissile
7,92734170
7,92734170
answered Nov 16 '18 at 15:56
MaxMax
27715
answered Nov 16 '18 at 15:56
MaxMax
27715
answered Nov 16 '18 at 15:56
MaxMax
27715
27715
1
If you're usingFirstOrDefault, then it's better to includenullchecking so that OP would understand that.
– JohnyL
Nov 16 '18 at 18:57
add a comment |
1
If you're usingFirstOrDefault, then it's better to includenullchecking so that OP would understand that.
– JohnyL
Nov 16 '18 at 18:57
1
1
If you're using
FirstOrDefault, then it's better to include null checking so that OP would understand that.– JohnyL
Nov 16 '18 at 18:57
If you're using
FirstOrDefault, then it's better to include null checking so that OP would understand that.– JohnyL
Nov 16 '18 at 18:57
add a comment |
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