//获取某一列值

string orderids = (from d in dt.AsEnumerable() select d.Field("OrderID")).ToList().ListToString();

///

/// 判断字符串是否在某字符串数组当中

///

///

///

///

public static bool In(this string value, params string[] items)

{

return items.Any(item => value == item);

}

///

/// 判断字符串是否在某字符串数组当中

///

///

///

///

public static bool In(this Enum value, params Enum[] items)

{

return items.Any(item => value.Equals(item));

}

///

/// 判断字符串是否在另一字符当中出现

///

///

///

///

public static bool Like(this string value, string param)

{

return value.Contains(param);

}

///

/// 将List数组转化成分隔的字符串

///

///

///

public static string ListToString(this IList values, char split = ',')

{

var result = string.Empty;

foreach (var item in values)

{

result += item.ToString() + split;

}

result = result.TrimEnd(split);

return result;

}

///

/// 判断字符串是null或者string.Empty

///

///

///

public static bool IsNullOrEmpty(this string value)

{

return string.IsNullOrEmpty(value);

}

///

/// 对象转字符串，null返回空字符串

///

///

///

public static string ObjectToString(this object obj)

{

if (obj == null)

{

return string.Empty;

}

return obj.ToString().Trim();

}

///

/// 过滤Xml特殊字符

///

///

///

public static string FilterSpecailCharOfXml(this string str)

{

var value = str.ObjectToString();

value = value.Replace("'", " ");

value = value.Replace("\"", " ");

value = value.Replace("

value = value.Replace(">", " ");

//value = value.Replace("&", " ");

return value;

}

///

/// 过滤空白字符

///

///

///

public static string FilterWhiteSpace(this string str)

{

Regex whitespace = new Regex(@"\s+", RegexOptions.Compiled);

return whitespace.Replace(str, "");

}

///

/// 首拼查询

///

///

///

///

public static bool FirstLike(this string strText, string firstChar)

{

int len = strText.Length;

string myStr = "";

for (int i = 0; i < len; i++)

{

myStr += getSpell(strText.Substring(i, 1));

}

return myStr.Contains(firstChar.ToUpper());

}