ASP.NET Razor 拆分记录并加一

Question

在我的代码中，我试图在文本框中显示数据库中最后一条记录之后的记录。例如，如果我的最后一条记录是 A560，我想显示 A561。为了实现这一点，我知道我必须拆分记录然后对其进行操作，但我没有任何运气。这是数据库的样子：

Point_ID    Project No.    Project Manager    Comments
A558        1304           Oscar Duran        Found destroyed
A559        1304           Oscar Duran        Helicopter access
A560        1356           Julio Bravo        Airport parking lot

到目前为止，这是我的代码：

@{  
Layout = "~/_Layout.cshtml";

var db = Database.Open("ControlPoints");                                                    
var SelectCommand = "SELECT * FROM( SELECT TOP 5 * FROM AllControlMergedND WHERE Point_ID LIKE 'A___' ORDER BY Point_ID DESC )AS BaseData Order BY Point_ID ASC";                       
var SearchTerm = "";                                                                        

if(!Request.QueryString["SearchCP"].IsEmpty() ){                                            
    SelectCommand = "SELECT * FROM AllControlMergedND WHERE Point_ID = @0";                 
    SearchTerm = Request.QueryString["SearchCP"];                                           
}

if(!Request.QueryString["SearchProject"].IsEmpty() ){                                       
    SelectCommand = "SELECT * FROM AllControlMergedND WHERE [Project Used on] LIKE @0";
    SearchTerm = "%" + Request["SearchProject"] + "%";
}

var SelectData = db.Query(SelectCommand, SearchTerm);                                       
var grid = new WebGrid(source: SelectData, rowsPerPage: 10);                                
}

@{  
Validation.RequireField("Point_ID", " Required");                                           
Validation.RequireField("ProjectNo", " Required");                                          
Validation.RequireField("ProjectManager", " Required");

var Point_ID = "";                                                                          
var ProjectNo = "";                                                                         
var ProjectManager = "";

if(IsPost && Validation.IsValid() ){                                                        
    Point_ID = Request.Form["Point_ID"];
    ProjectNo = Request.Form["ProjectNo"];
    ProjectManager = Request.Form["ProjectManager"];
    db = Database.Open("ControlPoints");
    var InsertCommand = "INSERT INTO AllControlMergedND ([Point_ID], [Project No.], [Project Manager]) VALUES(@0, @1, @2)";
    db.Execute(InsertCommand, Point_ID, ProjectNo, ProjectManager);                                    

}


var SelectLastCP = "SELECT TOP 1 Point_ID FROM AllControlMergedND WHERE Point_ID LIKE 'A___' ORDER BY Point_ID DESC"; 
var SelectData2 = db.QuerySingle(SelectLastCP);                                             
var SuggestedPoint_ID = SelectData2.Point_ID;

}

<h2>Airborne Imaging Control Points Database</h2><br/><br/>                                 
    <form method="get">
        <fieldset>                                                                          
            <legend>Search Criteria</legend>                                                
            <div>
                <p><label for="SearchCP">Control Point ID:</label>                          
                <input type="text" name="SearchCP" value="@Request.QueryString["SearchCP"]" /> 
                <input type="submit" value="Search"/></p>                                   
            </div>
            <div>
                <p><label for="SearchProject">Project:</label>                              
                <input type="text" name="SearchProject" value="@Request.QueryString["SearchProject"]" />
                <input type="Submit" value="Search" /></p>
            </div>
        </fieldset>
    </form>
    <div>
        @grid.GetHtml(                                                                      
            tableStyle: "grid",                                                             
            headerStyle: "head",                                                            
            alternatingRowStyle: "alt",                                                     
            columns: grid.Columns(
                grid.Column("Point_ID"),
                grid.Column("Project No."),
                grid.Column("Project Used on"),
                grid.Column("WGS84 Lat"),
                grid.Column("WGS84 Long"),
                grid.Column("Ellips_Ht"),
                grid.Column("Project Manager"),
                grid.Column("Comments")
            )
        )
        <br/><br/>
    </div>

    <form method="post">                                                                    
        <fieldset>
            <legend>Create Control Point(s)</legend>
            <p><label for="Point_ID">Point ID:</label>
            <input type="text" name="Point_ID" value="@SuggestedPoint_ID" />
            @Html.ValidationMessage("Point_ID")</p>                                        

            <p><label for="ProjectNo">Project No:</label>
            <input type="text" name="ProjectNo" value="@Request.Form["ProjectNo"]" />
            @Html.ValidationMessage("ProjectNo")</p>                                        

            <p><label for="ProjectManager">Project Manager:</label>
            <input type="text" name="ProjectManager" value="@Request.Form["ProjectManager"]" />
            @Html.ValidationMessage("ProjectManager")</p>                                   

            <p><input type="submit" name="ButtonConfirm" value="Confirm" /></p>
        </fieldset>
    </form>

如您所见，我所能做的就是在文本框中显示我数据库的最后一条记录，在本例中为 A560。变量 'SuggestedPoint_ID' 保存着那条记录。我试过转换数据类型，但没有成功。任何帮助将不胜感激。

更新：

我需要做的是如下操作。将 A560 拆分为两部分 'A' 和 '560'。然后将'560'加一得到'561'，最后再次将'A'附加到'561'以获得下一个增量'A561'。

Answer 1

例如，如果您尝试将 "A560" 转换为 int，那么它将无法工作，因为您没有有效的数字。需要删除 A。

var SuggestedPoint_ID = SelectData2.Point_ID.Replace("A", "");

这不是我推荐的方法，因为 A 可以是 AA 或 B 或 ZZZZ 等任何内容。我的意思是你需要描述你需要什么才能更好地解决你的问题。

更新

var source = "A560";
var lhs = source.Substring(0, 1);
var tmp = source.Replace(lhs, "");
int rhs;
if(int.TryParse(tmp, out rhs))
{
    rhs++;
}
var result = string.Format("{0}{1}", lhs, rhs);

ASP.NET Razor 拆分记录并加一

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