private Dictionary<string, string> CreatSearchPara()

        {

            Dictionary<string, string> SearchPara = new Dictionary<string, string>();

            if (!string.IsNullOrEmpty(txtMaterial.Text.Trim())) SearchPara["Material"] = txtMaterial.Text.Trim();

            if (!string.IsNullOrEmpty(txtPurchaseOrder.Text.Trim())) SearchPara["PurchaseOrder"] = txtPurchaseOrder.Text.Trim();

            if (!string.IsNullOrEmpty(txtPurchaser.Text.Trim())) SearchPara["Purchaser"] = txtPurchaser.Text.Trim();

　　　　　}

 　　Dictionary<string, string> SearchPara = CreatSearchPara();

　　 dtReInpect = InspectReport.LoadIQCList(SearchPara);
//使用方法

public static DataTable LoadIQCList(Dictionary<string, string> SearchPara)
{
　　if (!(SearchPara != null && SearchPara.Count > 0)) return null;
　　string strSlectWhere = string.Empty;
　　string strWhere = string.Empty;

　　StringBuilder Sql_Where = new StringBuilder();

　　if (SearchPara.ContainsKey("Material"))
　　{
　　　　Sql_Where.Append(" and ( PN like '%" + SearchPara["Material"] + "%' or PN_DESC like '%" + SearchPara["Material"] + "%') ");
　　}
　　if (SearchPara.ContainsKey("PurchaseOrder"))
　　{
　　　　Sql_Where.Append(" and PO like '%" + SearchPara["PurchaseOrder"] + "%'");
　　}
}