I have a question about using LINQ to access a Database and trying to make use of it's version of accessing the LIKE
comparison operator.
I know that LINQ has .Contains()
, .StartsWith()
, and .EndsWith()
as comparison methods. However I am wondering if there is a way to programatically imcorporate SQL Wildcards into a LINQ statement without explicitly using these query operators. Let me explain my situation.
I am writing a program that accesses a database, and part of the program is a search window which the user can use to help them find specific database data. I would like to try and incorporate SQL Wildcards into the textbox fields for these search pages.
For example if a user enters the input 17%
I'd want the program to check for anything in that specific column that starts with a 17
. The same is true with %17
and 17
where I'd want it to search for columns that end with, and contain the values.
Currently, this is the code I have for my search method:
Public Function Data_Search(sData As List(Of String), DB As CustomDataContext) As DataGridView
Dim gridData As New DataGridView
Dim query = From p In DB.Parts
Select p.Part_Number, p.Part_Description, p.Supplier.Supplier_Name
for i = 0 To sData.Count - 1
If Not sData(i).ToString() = "" Then
Select Case i
Case 0
Dim partNum As String = sData(i).ToString()
query = query.Where(Function(x) x.Part_Number.Contains(partNum))
Case 1
Dim description As String = sData(i).ToString()
query = query.Where(Function(x) x.Part_Description.Contains(description))
Case 2
Dim supp As String = sData(i).ToString()
query = query.Where(Function(x) x.Supplier_Name.Contains(supp))
End Select
End If
Next
gridData.DataSource = query.ToList()
Return gridData
End Function
So right now I am trying to see if there is a way for me to modify the code in a way that doesn't essentially involve me putting a substring search into each Case
section to determine if I should be using StartsWith()
, Contains()
, or EndsWith
.
Thanks for your time.
如果您正在使用LINQ to SQL,并且正在与Microsoft SQL Server通讯,则可以使用SQLMethods.Like
来实现SQL LIKE
:
query = query.Where(Function(x) SQLMethods.Like(x.Part_Number, partNum))
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