Operator '>=' cannot be applied to operands of type 'object' and 'int' in datagridview cell values
1
I want to make sure that a value of one of my cells in my datagridview is greater than 0 to do something. but it gives me the error I mentioned.
if (dataGridView1.CurrentRow.Cells["totalQTYColumnDataGridViewTextBoxColumn"].Value >= 0) {
do something
}
I dont know how to convert it into Int when I do this it says its wrong:
if (dataGridView1.CurrentRow.Convert.ToInt32(Cells["totalQTYColumnDataGridViewTextBoxColumn"].Value) >= 0) {
do something
}
c# datagridview
asked Nov 13 '18 at 9:09
Daniel_RanjbarDaniel_Ranjbar
828
add a comment |
1
I want to make sure that a value of one of my cells in my datagridview is greater than 0 to do something. but it gives me the error I mentioned.
if (dataGridView1.CurrentRow.Cells["totalQTYColumnDataGridViewTextBoxColumn"].Value >= 0) {
do something
}
I dont know how to convert it into Int when I do this it says its wrong:
if (dataGridView1.CurrentRow.Convert.ToInt32(Cells["totalQTYColumnDataGridViewTextBoxColumn"].Value) >= 0) {
do something
}
c# datagridview
asked Nov 13 '18 at 9:09
Daniel_RanjbarDaniel_Ranjbar
828
2
Possible duplicate of retrieving number value from datagridview C#
– mjwills
Nov 13 '18 at 9:10
You need to convert yourobjecttoint. Otherwise there is no possible comparison. The types of the objects you want to compare are different, thus can't be compared.
– RedFox
Nov 13 '18 at 9:12
add a comment |
1
1
1
I want to make sure that a value of one of my cells in my datagridview is greater than 0 to do something. but it gives me the error I mentioned.
if (dataGridView1.CurrentRow.Cells["totalQTYColumnDataGridViewTextBoxColumn"].Value >= 0) {
do something
}
I dont know how to convert it into Int when I do this it says its wrong:
if (dataGridView1.CurrentRow.Convert.ToInt32(Cells["totalQTYColumnDataGridViewTextBoxColumn"].Value) >= 0) {
do something
}
c# datagridview
asked Nov 13 '18 at 9:09
Daniel_RanjbarDaniel_Ranjbar
828
I want to make sure that a value of one of my cells in my datagridview is greater than 0 to do something. but it gives me the error I mentioned.
if (dataGridView1.CurrentRow.Cells["totalQTYColumnDataGridViewTextBoxColumn"].Value >= 0) {
do something
}
I dont know how to convert it into Int when I do this it says its wrong:
if (dataGridView1.CurrentRow.Convert.ToInt32(Cells["totalQTYColumnDataGridViewTextBoxColumn"].Value) >= 0) {
do something
}
c# datagridview
c# datagridview
asked Nov 13 '18 at 9:09
Daniel_RanjbarDaniel_Ranjbar
828
asked Nov 13 '18 at 9:09
Daniel_RanjbarDaniel_Ranjbar
828
edited Nov 13 '18 at 9:15
Daniel_Ranjbar
asked Nov 13 '18 at 9:09
Daniel_RanjbarDaniel_Ranjbar
828
asked Nov 13 '18 at 9:09
Daniel_RanjbarDaniel_Ranjbar
828
asked Nov 13 '18 at 9:09
Daniel_RanjbarDaniel_Ranjbar
828
828
2
Possible duplicate of retrieving number value from datagridview C#
– mjwills
Nov 13 '18 at 9:10
You need to convert yourobjecttoint. Otherwise there is no possible comparison. The types of the objects you want to compare are different, thus can't be compared.
– RedFox
Nov 13 '18 at 9:12
add a comment |
2
Possible duplicate of retrieving number value from datagridview C#
– mjwills
Nov 13 '18 at 9:10
You need to convert yourobjecttoint. Otherwise there is no possible comparison. The types of the objects you want to compare are different, thus can't be compared.
– RedFox
Nov 13 '18 at 9:12
2
2
Possible duplicate of retrieving number value from datagridview C#
– mjwills
Nov 13 '18 at 9:10
Possible duplicate of retrieving number value from datagridview C#
– mjwills
Nov 13 '18 at 9:10
You need to convert your
object to int. Otherwise there is no possible comparison. The types of the objects you want to compare are different, thus can't be compared.– RedFox
Nov 13 '18 at 9:12
You need to convert your
object to int. Otherwise there is no possible comparison. The types of the objects you want to compare are different, thus can't be compared.– RedFox
Nov 13 '18 at 9:12
add a comment |
1 Answer
1
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4
You have first parse the value as an integer and then make the compare. You can't compare an System.Object with an integer literal.
var cell = dataGridView1.CurrentRow.Cells["totalQTYColumnDataGridViewTextBoxColumn"];
int totalQTY;
if(int.TryParse(cell.Value?.ToString(), out totalQTY)
&& totalQTY >= 0)
{
}
Note: int.TryParse returns true when parsing succeeds otherwise returns false. When parsing succeeds the parsed value is copied to totalQTY.
answered Nov 13 '18 at 9:12
ChristosChristos
43.7k84476
Thank you you solved my problem with details :)
– Daniel_Ranjbar
Nov 13 '18 at 9:25
2
@absolute455 if the value can benull, I recommend.Value?.ToString()stackoverflow.com/questions/5646145/…
– Slai
Nov 13 '18 at 9:28
@slai what? you mean I add a question mark? what does it do?
– Daniel_Ranjbar
Nov 13 '18 at 13:15
2
@absolute455 This is called conditional operator. IfValueisnulland you callToStringon it you will get aNullReferenceExceptionand your program would stop unexpectedly to work - unless the corresponding code is wrapped in atry/catchblock. Null conditional operator would save you from that and the call onToStringwould be done only whenValueis not null. For further info please have a look at docs.microsoft.com/en-us/dotnet/csharp/language-reference/…
– Christos
Nov 13 '18 at 13:43
@absolute455 You are very welcome !
– Christos
Nov 14 '18 at 8:37
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
4
You have first parse the value as an integer and then make the compare. You can't compare an System.Object with an integer literal.
var cell = dataGridView1.CurrentRow.Cells["totalQTYColumnDataGridViewTextBoxColumn"];
int totalQTY;
if(int.TryParse(cell.Value?.ToString(), out totalQTY)
&& totalQTY >= 0)
{
}
Note: int.TryParse returns true when parsing succeeds otherwise returns false. When parsing succeeds the parsed value is copied to totalQTY.
answered Nov 13 '18 at 9:12
ChristosChristos
43.7k84476
Thank you you solved my problem with details :)
– Daniel_Ranjbar
Nov 13 '18 at 9:25
2
@absolute455 if the value can benull, I recommend.Value?.ToString()stackoverflow.com/questions/5646145/…
– Slai
Nov 13 '18 at 9:28
@slai what? you mean I add a question mark? what does it do?
– Daniel_Ranjbar
Nov 13 '18 at 13:15
2
@absolute455 This is called conditional operator. IfValueisnulland you callToStringon it you will get aNullReferenceExceptionand your program would stop unexpectedly to work - unless the corresponding code is wrapped in atry/catchblock. Null conditional operator would save you from that and the call onToStringwould be done only whenValueis not null. For further info please have a look at docs.microsoft.com/en-us/dotnet/csharp/language-reference/…
– Christos
Nov 13 '18 at 13:43
@absolute455 You are very welcome !
– Christos
Nov 14 '18 at 8:37
add a comment |
4
You have first parse the value as an integer and then make the compare. You can't compare an System.Object with an integer literal.
var cell = dataGridView1.CurrentRow.Cells["totalQTYColumnDataGridViewTextBoxColumn"];
int totalQTY;
if(int.TryParse(cell.Value?.ToString(), out totalQTY)
&& totalQTY >= 0)
{
}
Note: int.TryParse returns true when parsing succeeds otherwise returns false. When parsing succeeds the parsed value is copied to totalQTY.
answered Nov 13 '18 at 9:12
ChristosChristos
43.7k84476
Thank you you solved my problem with details :)
– Daniel_Ranjbar
Nov 13 '18 at 9:25
2
@absolute455 if the value can benull, I recommend.Value?.ToString()stackoverflow.com/questions/5646145/…
– Slai
Nov 13 '18 at 9:28
@slai what? you mean I add a question mark? what does it do?
– Daniel_Ranjbar
Nov 13 '18 at 13:15
2
@absolute455 This is called conditional operator. IfValueisnulland you callToStringon it you will get aNullReferenceExceptionand your program would stop unexpectedly to work - unless the corresponding code is wrapped in atry/catchblock. Null conditional operator would save you from that and the call onToStringwould be done only whenValueis not null. For further info please have a look at docs.microsoft.com/en-us/dotnet/csharp/language-reference/…
– Christos
Nov 13 '18 at 13:43
@absolute455 You are very welcome !
– Christos
Nov 14 '18 at 8:37
add a comment |
4
4
4
You have first parse the value as an integer and then make the compare. You can't compare an System.Object with an integer literal.
var cell = dataGridView1.CurrentRow.Cells["totalQTYColumnDataGridViewTextBoxColumn"];
int totalQTY;
if(int.TryParse(cell.Value?.ToString(), out totalQTY)
&& totalQTY >= 0)
{
}
Note: int.TryParse returns true when parsing succeeds otherwise returns false. When parsing succeeds the parsed value is copied to totalQTY.
answered Nov 13 '18 at 9:12
ChristosChristos
43.7k84476
You have first parse the value as an integer and then make the compare. You can't compare an System.Object with an integer literal.
var cell = dataGridView1.CurrentRow.Cells["totalQTYColumnDataGridViewTextBoxColumn"];
int totalQTY;
if(int.TryParse(cell.Value?.ToString(), out totalQTY)
&& totalQTY >= 0)
{
}
Note: int.TryParse returns true when parsing succeeds otherwise returns false. When parsing succeeds the parsed value is copied to totalQTY.
answered Nov 13 '18 at 9:12
ChristosChristos
43.7k84476
edited Nov 13 '18 at 11:53
answered Nov 13 '18 at 9:12
ChristosChristos
43.7k84476
answered Nov 13 '18 at 9:12
ChristosChristos
43.7k84476
answered Nov 13 '18 at 9:12
ChristosChristos
43.7k84476
43.7k84476
Thank you you solved my problem with details :)
– Daniel_Ranjbar
Nov 13 '18 at 9:25
2
@absolute455 if the value can benull, I recommend.Value?.ToString()stackoverflow.com/questions/5646145/…
– Slai
Nov 13 '18 at 9:28
@slai what? you mean I add a question mark? what does it do?
– Daniel_Ranjbar
Nov 13 '18 at 13:15
2
@absolute455 This is called conditional operator. IfValueisnulland you callToStringon it you will get aNullReferenceExceptionand your program would stop unexpectedly to work - unless the corresponding code is wrapped in atry/catchblock. Null conditional operator would save you from that and the call onToStringwould be done only whenValueis not null. For further info please have a look at docs.microsoft.com/en-us/dotnet/csharp/language-reference/…
– Christos
Nov 13 '18 at 13:43
@absolute455 You are very welcome !
– Christos
Nov 14 '18 at 8:37
add a comment |
Thank you you solved my problem with details :)
– Daniel_Ranjbar
Nov 13 '18 at 9:25
2
@absolute455 if the value can benull, I recommend.Value?.ToString()stackoverflow.com/questions/5646145/…
– Slai
Nov 13 '18 at 9:28
@slai what? you mean I add a question mark? what does it do?
– Daniel_Ranjbar
Nov 13 '18 at 13:15
2
@absolute455 This is called conditional operator. IfValueisnulland you callToStringon it you will get aNullReferenceExceptionand your program would stop unexpectedly to work - unless the corresponding code is wrapped in atry/catchblock. Null conditional operator would save you from that and the call onToStringwould be done only whenValueis not null. For further info please have a look at docs.microsoft.com/en-us/dotnet/csharp/language-reference/…
– Christos
Nov 13 '18 at 13:43
@absolute455 You are very welcome !
– Christos
Nov 14 '18 at 8:37
Thank you you solved my problem with details :)
– Daniel_Ranjbar
Nov 13 '18 at 9:25
Thank you you solved my problem with details :)
– Daniel_Ranjbar
Nov 13 '18 at 9:25
2
2
@absolute455 if the value can be
null, I recommend .Value?.ToString() stackoverflow.com/questions/5646145/…– Slai
Nov 13 '18 at 9:28
@absolute455 if the value can be
null, I recommend .Value?.ToString() stackoverflow.com/questions/5646145/…– Slai
Nov 13 '18 at 9:28
@slai what? you mean I add a question mark? what does it do?
– Daniel_Ranjbar
Nov 13 '18 at 13:15
@slai what? you mean I add a question mark? what does it do?
– Daniel_Ranjbar
Nov 13 '18 at 13:15
2
2
@absolute455 This is called conditional operator. If
Value is null and you call ToString on it you will get a NullReferenceException and your program would stop unexpectedly to work - unless the corresponding code is wrapped in a try/catch block. Null conditional operator would save you from that and the call on ToString would be done only when Value is not null. For further info please have a look at docs.microsoft.com/en-us/dotnet/csharp/language-reference/…– Christos
Nov 13 '18 at 13:43
@absolute455 This is called conditional operator. If
Value is null and you call ToString on it you will get a NullReferenceException and your program would stop unexpectedly to work - unless the corresponding code is wrapped in a try/catch block. Null conditional operator would save you from that and the call on ToString would be done only when Value is not null. For further info please have a look at docs.microsoft.com/en-us/dotnet/csharp/language-reference/…– Christos
Nov 13 '18 at 13:43
@absolute455 You are very welcome !
– Christos
Nov 14 '18 at 8:37
@absolute455 You are very welcome !
– Christos
Nov 14 '18 at 8:37
add a comment |
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2
Possible duplicate of retrieving number value from datagridview C#
– mjwills
Nov 13 '18 at 9:10
You need to convert your
objecttoint. Otherwise there is no possible comparison. The types of the objects you want to compare are different, thus can't be compared.– RedFox
Nov 13 '18 at 9:12