无法从'拉姆达前pression'到'system.func动态对象“MVC3剃刀转换 [英] Cannot convert from 'lambda expression' to 'system.func dynamic object ' MVC3 Razor

问题描述

我得到WebGrid.column错误提到的错误和参数无效在我看来页面。

I'm getting the mentioned error and "Invalid arguments" for WebGrid.column error in my view page.

//查看

@{
    WebGrid grid = new WebGrid(Model.LoadProductDetails());
     @grid.GetHtml(
         tableStyle: "grid",
         fillEmptyRows: false,
         headerStyle: "gvHeading",
         alternatingRowStyle: "gvAlternateRow",
         rowStyle: "gvRow",
         footerStyle: "gvFooter",
         mode: WebGridPagerModes.All,
         firstText: "<< First",
         previousText: "< Prev",
         nextText: "Next >",
         lastText: "Last >>",
         columns: new[] {
         grid.Column("ProductId",header: "ID"),
         grid.Column("ProductName",header: "Product"),
         grid.Column("Price"),
         grid.Column("Qunatity"),     
         grid.Column("ReorderLevel", header: "R.O.L."),
         grid.Column("ContactusId", header: "Action", canSort:false, format: @<text> @Html.Raw("<img src='/img/edit.png' title='Edit' onclick='EditProduct("+ item.ProductId  ")'  />") @Html.Raw("<img src='/img/delete.png' title='Delete' onclick='DeleteProduct("+ item.ProductId +")'  />") </text>)       
     })    
}

该错误抛出的最后一列（ContactUsId）附近的格式：。在那里我错了？

请帮助。

推荐答案

这是我的意见：它看起来像你试图注入客户端HTML到服务器端函数调用（这反过来又产生客户端输出） 。这就是MVC的工作原理（code注入到网页HTML）相反。你需要让那些@＆LT;>到C＃字符串。然后，它可以被处理服务器端和所得GetHtml方法将注入的最终结果到输出。

From my comment: It looks like you are trying to inject client-side HTML into a server-side function call (which in turn generates client-side output). That is the opposite of how MVC works (code injects into the page HTML). You need to make those @<> into C# strings. Then it can be processed server-side and the resulting GetHtml method will inject the final result into the output.

@{
    string template = "<text><img src='/img/edit.png' title='Edit' onclick='EditProduct("+ item.ProductId + ")' /><img src='/img/delete.png' title='Delete' onclick='DeleteProduct("+ item.ProductId +")' /></text>";
    WebGrid grid = new WebGrid(Model.LoadProductDetails());
     @grid.GetHtml(
         tableStyle: "grid",
         fillEmptyRows: false,
         headerStyle: "gvHeading",
         alternatingRowStyle: "gvAlternateRow",
         rowStyle: "gvRow",
         footerStyle: "gvFooter",
         mode: WebGridPagerModes.All,
         firstText: "<< First",
         previousText: "< Prev",
         nextText: "Next >",
         lastText: "Last >>",
         columns: new[] {
         grid.Column("ProductId",header: "ID"),
         grid.Column("ProductName",header: "Product"),
         grid.Column("Price"),
         grid.Column("Qunatity"),     
         grid.Column("ReorderLevel", header: "R.O.L."),
         grid.Column("ContactusId", header: "Action", canSort:false, format: template)    
}

道歉任何错别字，但是这仅仅是指示你应该做的事情，而不是试图用剃刀语法（这永远不会工作）注入HTML到C＃。

Apologies for any typos, but this is just to indicate what you should be doing instead of trying to inject HTML into C# using Razor syntax (which would never work).

作为一个可读性提高，我会用的String.Format 模板中的字符串替换标记。

As a readability improvement I would use string.Format to replace markers in the template string.

例如

    string template = string.format("<text><img src='/img/edit.png' title='Edit' onclick='EditProduct({0})' /><img src='/img/delete.png' title='Delete' onclick='DeleteProduct({0})' /></text>", item.ProductId);

这篇关于无法从'拉姆达前pression'到'system.func动态对象“MVC3剃刀转换的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！