[英]c# contains part of string
所以我有一个Materiel-objects列表。 在Materiel我有15个get和set方法。 我想构建一个搜索方法,循环列表中的所有对象,以及每个Materiel对象中的所有变量。 循环部分很容易,但我正在努力使用字符串包含部分。 搜索词可以是例如“acto”,我应该得到“Tractor”的命中。 我已经尝试过使用string-Contains类,但据我所知,它只检查从位置0开始的字符串。所以“Tra”得到一个命中,但不是“acto”。
课程中是否有任何构建,或者我应该自己编程?
对不起,解释不好。
我的代码。 我现在看到我得到子串的命中,但也有其他结果:)
protected void Button_search_Click(object sender, EventArgs e)
{
string searchTerm = TextBox1.Text.ToString().ToLower();
TableRow row;
TableCell cell;
int rowNumber = 1;
foreach (Materiell mat in allItems)
{
if (searchTerm.Contains(mat.itemID.ToString().ToLower()) ||
searchTerm.Contains(mat.manufacturer.ToLower()) ||
searchTerm.Contains(mat.model.ToLower()) ||
searchTerm.Contains(mat.serialNo.ToLower()) ||
searchTerm.Contains(mat.dateProd.ToString().ToLower()) ||
searchTerm.Contains(mat.location.ToLower()) ||
searchTerm.Contains(mat.mainCategory.ToLower()) ||
searchTerm.Contains(mat.subCategory.ToLower()) ||
searchTerm.Contains(mat.dateAcquired.ToString().ToLower()) ||
searchTerm.Contains(mat.price.ToString().ToLower()) ||
searchTerm.Contains(mat.ownerID.ToString().ToLower()) ||
searchTerm.Contains(mat.extra.ToString().ToLower()) ||
searchTerm.Contains(mat.textComment.ToLower()) ||
searchTerm.Contains(mat.active.ToString().ToLower()))
{
row = new TableRow();
row.ID = "row" + rowNumber.ToString();
rowNumber++;
cell = new TableCell();
cell.Text = "<a href=\"#\" class=\"opendiv\">" + mat.itemID.ToString() + "</a>";
row.Cells.Add(cell);
cell = new TableCell();
cell.Text = mat.manufacturer.ToString();
row.Cells.Add(cell);
cell = new TableCell();
cell.Text = mat.model.ToString();
row.Cells.Add(cell);
cell = new TableCell();
cell.Text = mat.serialNo.ToString();
row.Cells.Add(cell);
cell = new TableCell();
cell.Text = mat.dateProd.ToString();
row.Cells.Add(cell);
cell = new TableCell();
cell.Text = mat.location.ToString();
row.Cells.Add(cell);
cell = new TableCell();
cell.Text = mat.mainCategory.ToString();
row.Cells.Add(cell);
cell = new TableCell();
cell.Text = mat.subCategory.ToString();
row.Cells.Add(cell);
cell = new TableCell();
cell.Text = mat.dateAcquired.ToString();
row.Cells.Add(cell);
cell = new TableCell();
cell.Text = mat.price.ToString();
row.Cells.Add(cell);
cell = new TableCell();
cell.Text = mat.ownerID.ToString();
row.Cells.Add(cell);
cell = new TableCell();
cell.Text = mat.extra.ToString();
row.Cells.Add(cell);
cell = new TableCell();
cell.Text = mat.ownDefData.ToString();
row.Cells.Add(cell);
cell = new TableCell();
cell.Text = mat.textComment.ToString();
row.Cells.Add(cell);
cell = new TableCell();
cell.Text = mat.active.ToString();
row.Cells.Add(cell);
Table1.Rows.Add(row);
}
}
}
"some string".Contains("str")
将返回true,你是否遇到了案例敏感性问题?
如果是这样,你可以使用这个:
public static bool Contains(this string source, string toCheck, StringComparison comp) {
return source.IndexOf(toCheck, comp) >= 0;
}
string title = "STRING";
bool contains = title.Contains("string", StringComparison.OrdinalIgnoreCase);
使用IndexOf
string searchWithinThis = "ABCDEFGHIJKLMNOP";
string searchForThis = "DEF";
int firstCharacter = searchWithinThis.IndexOf(searchForThis);
Console.WriteLine("First occurrence: {0}", firstCharacter);
如果未找到substring,则返回-1。 它非常有用,也可以知道字符串的位置。
对于屎和笑声,我认为这是一个很好的午餐休息项目,为问题提出一个简单但“优雅”的解决方案(据我了解:) :):
例如
// I made up a Material class for testing:
public class Materiel
{
public string A { get; set; }
public int B { get; set; }
public DateTime? C { get; set; }
public string D { get; set; }
public Nested E { get; set; }
}
// [...] usage:
foreach (var pattern in new[]{ "World" , "dick", "Dick", "ick", "2012", "Attach" })
Console.WriteLine("{0} records match '{1}'", Database.Search(pattern).Count(), pattern);
输出:
2 records match 'World'
1 records match 'dick'
1 records match 'Dick'
2 records match 'ick'
1 records match '2012'
2 records match 'Attach'
该代码也支持
请享用:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text.RegularExpressions;
namespace AClient
{
public class Materiel
{
public string A { get; set; }
public int B { get; set; }
public DateTime? C { get; set; }
public string D { get; set; }
public Nested E { get; set; }
}
public struct Nested
{
public string Data { get; set; }
public override string ToString() { return string.Format("Extra: {0}", Data); }
}
public static class FullText
{
public class PropMatched<T> { public PropertyInfo Property; public T Item; }
public static IEnumerable<PropMatched<T> > ByProperty<T>(this IEnumerable<T> items, string substr)
{
return items.ByProperty(new Regex(Regex.Escape(substr), RegexOptions.IgnoreCase));
}
public static IEnumerable<PropMatched<T> > ByProperty<T>(this IEnumerable<T> items, Regex pattern)
{
return items.Select(i => i.MatchingProperties(pattern)).Where(m => null != m);
}
public static IEnumerable<T> Search<T>(this IEnumerable<T> items, string substr)
{
return items.Search(new Regex(Regex.Escape(substr), RegexOptions.IgnoreCase));
}
public static IEnumerable<T> Search<T>(this IEnumerable<T> items, Regex pattern)
{
return items.Where(i => null != i.MatchingProperties(pattern));
}
public static PropMatched<T> MatchingProperties<T>(this T item, Regex pattern)
{
if (null == pattern || null == item) return null;
var properties = item.GetType().GetProperties(BindingFlags.Public | BindingFlags.FlattenHierarchy | BindingFlags.Instance);
var matches = from prop in properties
let val = prop.GetGetMethod(true).Invoke(item, new object[]{})
where pattern.IsMatch((val??"").ToString())
select prop;
var found = matches.FirstOrDefault();
return found == null ? null : new PropMatched<T> {Item = item, Property = found};
}
}
class Client
{
private static readonly IEnumerable<Materiel> Database = new List<Materiel>
{
new Materiel {
A = "Hello", B = 1, C = null, D = "World",
E = new Nested {Data = "Attachment"}
},
new Materiel {
A = "Transfigured", B = 2, C = null, D = "Nights",
E = new Nested {Data = "Schoenberg"}
},
new Materiel {
A = "Moby", B = 3, C = null, D = "Dick",
E = new Nested {Data = "Biographic"}
},
new Materiel {
A = "Prick", B = 4, C = DateTime.Today, D = "World",
E = new Nested {Data = "Attachment"}
},
new Materiel {
A = "Oh Noes", B = 2, C = null, D = "Nights",
E = new Nested {Data = "Schoenberg"}
},
};
static void Main()
{
foreach (var pattern in new[]{ "World" , "dick", "Dick", "ick", "2012", "Attach" })
Console.WriteLine("{0} records match '{1}'", Database.Search(pattern).Count(), pattern);
// regex sample:
var regex = new Regex(@"N\w+s", RegexOptions.IgnoreCase);
Console.WriteLine(@"{0} records match regular expression 'N\w+s'", Database.Search(regex).Count());
// with context info:
foreach (var contextMatch in Database.ByProperty(regex))
{
Console.WriteLine("1 match of regex in propery {0} with value '{1}'",
contextMatch.Property.Name, contextMatch.Property.GetGetMethod().Invoke(contextMatch.Item, new object[0]));
}
}
}
}
class SearchInString
{
static void Main()
{
string strn= "A great things are happen with great humans.";
System.Console.WriteLine("'{0}'",strn);
bool case1= strn.StartsWith("A great");
System.Console.WriteLine("starts with 'A great'? {0}", case1);
bool case2= strn.StartsWith("A great", System.StringComparison.OrdinalIgnoreCase);
System.Console.WriteLine("starts with 'A great'? {0} (ignoring case)", case2);
bool case3= strn.EndsWith(".");
System.Console.WriteLine("ends with '.'? {0}", case3);
int start= strn.IndexOf("great");
int end= strn.LastIndexOf("great");
string strn2 = strn.Substring(start, end- start);
System.Console.WriteLine("between two 'great' words: '{0}'", strn2);
}
}
Bool doesContain = "Tractor".Contains("acto");
确实会是真的。
包含集合的作品,在这个例子中,我认为字符串被视为字符集合。
string.Contains
方法确实在字符串中的任何位置查找子字符串。
"asdf".Contains("as") --> True
"asdf".Contains("sd") --> True
"asdf".Contains("df") --> True
"asdf".Contains("xy") --> False
但是,这种比较具有案例意义,因此如果您想进行不区分大小写的搜索,则可能需要转换大小写:
"Asdf".Contains("as") --> False
"Asdf".Contains("As") --> True
"Asdf".ToUpper().Contains("as".ToUpper()) --> True
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.