中继器单击“问题”

问题描述

尝试以下代码时出错。

错误消息：值不能为空。参数名称：source



这些是我收到错误的行。



FoodTypeResponseDto selectedFoodTypes = this .FoodTypes.FirstOrDefault（r => r.FoodTypeId == foodTypeID）;



如何整理出来？



提前致谢。

I have got an error when try the following code.
Error Message: Value cannot be null. Parameter name: source

These are the lines where I got the error.

FoodTypeResponseDto selectedFoodTypes = this.FoodTypes.FirstOrDefault(r => r.FoodTypeId == foodTypeID);

How to sort it out?

Thanks in advance.

protected void RecipeManagementUserControl_RepeaterItemClick(object sender, CommandEventArgs e)
{

        if (e.CommandName == WellKnownCommandNames.Edit.ToString())
        {

            int foodTypeID = 0;
            if (!string.IsNullOrEmpty(e.CommandArgument.ToString()))
            {
                int.TryParse(e.CommandArgument.ToString(), out foodTypeID);

                this.FoodTypeID = foodTypeID;
                this.FoodType = ((LinkButton)(((RepeaterCommandEventArgs)(e)).CommandSource)).Text;

                LinkButton linkButton = (LinkButton)FindControl("foodTypeActionLinkButton");

                FoodTypeResponseDto selectedFoodTypes = this.FoodTypes.FirstOrDefault(r => r.FoodTypeId == foodTypeID);

                this.FoodType = selectedFoodTypes.Name;
                this.FoodTypeIndexID = selectedFoodTypes.IndexID;

                this.GetMultipleFoodData();
            }
        }
}

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