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  • 'ddlCities' has a SelectedValue which is invalid because it does not exist in the list of items

    this.ddlCities.DataSource = GetAll_List();
    this.ddlCities.DataTextField = "Name";
    this.ddlCities.DataValueField = "Id";
    this.ddlCities.DataBind();

    错误:

    'ddlCities' has a SelectedValue which is invalid because it does not exist in the list of items.
    Parameter name: value

    原因:

    多次执行了绑定,因此会出现重复的ListItem。

    解决方法:

    (1)检查是否有多次绑定。

    (2)添加 this.ddlCities.Items.Clear();

    this.ddlCities.Items.Clear();

    this.ddlCities.DataSource = GetAll_List();
    this.ddlCities.DataTextField = "Name";
    this.ddlCities.DataValueField = "Id";
    this.ddlCities.DataBind();

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  • 原文地址:https://www.cnblogs.com/emanlee/p/1456392.html
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